Selection of Stainless Steel for Hydrofluoric Acid HF

Selection of Stainless Steel for Hydrofluoric Acid HF

AP-42, CH 8.7 Hydorfluoric Acid

Traditionally, hydrofluoric acid has been used to etch and polish glass. Currently, the largest use for HF is in aluminum production. Other HF uses include uranium processing, petroleum alkylation, and stainless steel pickling. Hydrofluoric acid is also used to produce fluorocarbons used in aerosol sprays and in refrigerants.(plate) About HF Calgonate®(steel) When combined at 250°C, these two substances react to produce hydrogen fluoride. It is a colorless, fuming liquid or gas that is comprised of a hydrogen atom and a fluorine atom. The dissolved form is called hydrofluoric acid. Hydrofluoric acid is a highly corrosive solution of the chemical compound hydrogen fluoride in water.(plate) Acids & other Aggressive Chemicals British Stainless Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Austenitic stainless steels have good corrosion resistance to chemically pure phosphoric acid. Wet process phosphoric acid (WPA) can be aggressive. Selection of stainless steels for handling hydrofluoric acid (HF) Hydrofluoric Acid is extremely aggressive and attacks most metals and glass. The approach to the selection of stainless steels is Selection of Stainless Steel for Hydrofluoric Acid HF

Alloy selection for service in hydrogen fl uoride, hydrofl Selection of Stainless Steel for Hydrofluoric Acid HF

Hydrogen fluoride (HF) is a gas at room temperature. When dissolved in water it forms hydrofluoric acid. Hydrogen fluoride and hydrofluoric acid are available in four grades polyvinylidene fluoride (PVDF). HF is also used in a number of anhydrous hydrogen fluoride (AHF), 70% hydrofluoric acid, 48% reagent-grade hydrofluoric acid, and(plate) Alloy selection for service in sulphuric acid(steel) Stainless steel has replaced carbon steel and cast iron as the preferred material of construction for converters and acid coolers. New alloys and the use of anodic protection have increased resistance to corrosion by hot acid. In general, Type 304L (S30403) is specified for (plate) CORROSION HIGH Ni-Cr ALLOYS AND TYPE 304L (steel) Corrosion will be most severe in HNO3-HF used occasionally for flushing and in solutions of "03 and corrosion products (ferric and dichromate ions). HF corrosion can be minimized by complexing the fluoride ion and by passivation of the steel with strong nitric acid. corrosion products can be minimized by operating at lawer temperatures.

Chemical CLeaning of Metals - NZ Institute of Chemistry

stainless steel is corroded by the halide, and thus stainless steel corrodes as quickly as mild steel. For this reason, HNO3 (an acid of similar ionisation) is used widely for stainless steel pickling and cleaning. It is an oxidising acid and actually increases the protective Cr2O3 layer thickness of stainless steels.(plate) Corrosion behavior of 904L austenitic stainless steel in Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Corrosion behaviors of 904L austenitic stainless steel in HF and HCl were studied and compared using electrochemical method, microscopic analysis, and phase analysis. An insoluble layer is deposited on 904L in HF due to a preferential reaction between [F ] and the [Ni] from the alloy.(plate) Corrosion behavior of 904L austenitic stainless steel in Selection of Stainless Steel for Hydrofluoric Acid HF(steel) There are few studies on stainless steel corrosion in HF. Mason 1 found that certain amount of HF forms a stable iron uoride on the metal surface, which eectively inhibits stain-

Corrosion by Hydrogen Fluoride and Hydrofluoric Acid Selection of Stainless Steel for Hydrofluoric Acid HF

Abstract This article provides the corrosion data for materials in hydrofluoric acid (HF) and anhydrous hydrogen fluoride (AHF). These materials include carbon and low-alloy steels, austenitic stainless steels, nickel-rich austenitic stainless steels, nickel and nickel-base alloys, copper alloys, precious metals, and non-metals.(plate) Corrosion inhibition of 13Cr, Super 13Cr, and 15Cr Selection of Stainless Steel for Hydrofluoric Acid HF(steel) This paper presents and discusses the results of a laboratory study of the corrosion inhibition of 13Cr, Super 13Cr, and 15Cr martensitic stainless steel exposed to half strength mud acid solutions (7{1/2}wt.% HCl + 1{1/2}wt.% HF) over the temperature range of 210--250 F (99--121 C).(plate) Corrosion resistance of Nickel alloys in hydrofluoric acid(steel) The selection of a material for handling hydrofluoric acid should depend on the concentration, temperature, velocity and extent of aeration of acid and on the availability of contaminants. As with various non-oxidizing acids, aeration or the availability of oxidizing chemicals in hydrofluoric acid increases its corrosive attack on various metals.

Creation of superhydrophobic stainless steel surfaces by Selection of Stainless Steel for Hydrofluoric Acid HF

By passivating the HF-etched samples in a nitric acid bath, the corrosion resistant properties of stainless steels were recovered. When a three step process was used, consisting of etching, passivation and fluorocarbon deposition, 304 and 316 stainless steel samples exhibited maximum contact angles of 157.3 and 134.9°, respectively, while Selection of Stainless Steel for Hydrofluoric Acid HF(plate) Exploring factors controlling pre-corrosion fatigue of Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Jul 01, 2020Some scholars reported that the corrosion rate of austenitic stainless steel in anhydrous hydrofluoric acid (AHF) was lower than the rate in HF solution. The corrosion rate of 302 and 316 stainless steel at 83 °C in 12% HF was 3.05 mm/y and 17.78 mm/y [6] , while the corrosion rate of 304, 316, 316L at 100 °C in AHF was less than 0.127 mm/y Selection of Stainless Steel for Hydrofluoric Acid HF(plate) Fluoride Speciation in Stainless Steel Pickling Liquor Selection of Stainless Steel for Hydrofluoric Acid HF(steel) The influence of hydrofluoric acid and nitric acid concentration on the growth rate of -FeF33H2O crystals has been studied in different hydrofluoric acid (4.710.7 mol/(kg H2O)) and nitric Selection of Stainless Steel for Hydrofluoric Acid HF

HF Acid Scheduling - Australian Stainless Steel Selection of Stainless Steel for Hydrofluoric Acid HF

Hydrofluoric acid is an aggressive substance used in the stainless steel industry, usually to assist in removal of scale and the chrome depleted layer associated with welds. Changes in the National Drugs and Poisons Schedules have recently brought hydrofluoric acid (HF) into focus.(plate) HF Alky Piping Failures - Inspectioneering(steel) IntroductionExaminationsSummaryReferencesThis article provides a discussion of a recent inspection performed at a U.S. refinery. Industry HF lines are experiencing piping failures in increasing numbers due to the presence of residual elements (such as Cr, Ni, and Cu among others) entrained within their carbon steel components. Because of this, a non-destructive testing (NDT) inspection program was developed to identify and quantify this highly localized corrosion in carbon steel piping, along with assessing for damage in butt joints between different piping See more on inspectioneeringCLEANING AND DESCALING STAINLESS STEELS(steel) to stainless steel for protection age in fairly short periods of time (several Selection of Stainless Steel for Hydrofluoric Acid HF care must be exercised in the selection of acid Selection of Stainless Steel for Hydrofluoric Acid HF for all situations. COMMONLY USED ACIDS The acids most commonly used for pickling stainless steels are . 5 nitric (HNO 3), hydrofluoric (HF), sulphuric (H (plate) HFree - Hydrofluoric acid Selection of Stainless Steel for Hydrofluoric Acid HF - Stainless Steel World(steel) Sep 26, 2017A new pickling process which does not require the use of hydrofluoric acid has been developed as part of a project funded by the EU through the LIFE programme (project code 13 ENV/IT/000440). The process is beneficial in terms of both the environment and energy consumption. This article analyses the characteristics of the wastewater treatment process deriving from the new

HYDROFLUORIC ACID SCRUBBER SYSTEMS (Technical Report Selection of Stainless Steel for Hydrofluoric Acid HF

@article{osti_1016165, title = {HYDROFLUORIC ACID SCRUBBER SYSTEMS}, author = {JV, PANESKO and HD, MERRITT}, abstractNote = {Each year over a million gallons of water are used to scrub hydrogen fluoride (HP) vapors from waste off-gas streams. Use of other potential scrubber solutions such as potassium hydroxide (KOH), aluminum nitrate nonahydrate (ANN), and monobasic (plate) Hydroflouric Acid - Rolled Alloys, Inc.(steel) 416 stainless steel is a free-machining martensitic stainless steel with 12-13% chromium that can be hardened by heat treatment to higher strength and hardness levels. In the annealed condition, it has Selection of Stainless Steel for Hydrofluoric Acid HF(plate) Hydrofluoric (HF) Acid Corrosion Inspectioneering(steel) Hydroflouric (HF) Acid Corrosion is an acidic environment damage mechanism associated almost exclusively with HF Alkylation Units.Although these units are usually carefully controlled, unexpected problems with process control can lead to wet acid carryover into carbon steel sections, which were never intended to be exposed to HF acid, resulting in corrosion and leaks.

Hydrofluoric Acid - an overview ScienceDirect Topics

Mar 03, 2010Traditionally, hydrofluoric acid (HF) has been used to etch and polish glass. Currently, the largest use for HF is in aluminum production. Other HF uses include uranium processing, petroleum alkylation, and stainless steel pickling. Hydrofluoric acid is also used to produce fluorocarbons used in aerosol sprays and in refrigerants.(plate) Hydrofluoric Acid 40% (w/w) Reagent - Columbus Chemical(steel) Original on 02/07/2017 Page 1 of 6 Safety Data Sheet Hydrofluoric Acid 40% (w/w) Reagent 1. PRODUCT AND COMPANY IDENTIFICATION Product Name Hydrofluoric Acid 40% (w/w) Reagent Synonyms/Generic Names Hydrogen fluoride, Fluoric acid, Fluorhydric acid, Fluorine hydride Product Number 2696 Product Use Industrial, Manufacturing or Laboratory use(plate) Hydrofluoric Acid Spectrum(steel) Find one of the strongest inorganic acids in the industry with Spectrum's selection of hydrofluoric acid. Used mainly for industrial purposes like metal cleaning or electronics manufacturing, hydrofluoric acid is a solution of hydrogen fluoride in water, and a precursor to almost all fluorine compounds, including pharmaceuticals like fluoxetine and elemental fluorine.

Hydrofluoric Acid What You Need to Know EMS World

HF may be known as Hydrogen fluoride (UN 1052), hydrofluoric acid (UN 1790) or fluorohydric acid. Identification numbers are CAS number 7664-39-3, UN 1052 or RTECS MW7875000.(plate) Hydrofluoric Acid and Nitric Acid Mixtures Nitric and HF Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Hydrofluoric acid and nitric acid mixtures are used to etch the surface of titanium, stainless steel, and Nitinol medical device components to prepare them for the application of bioactive coatings. We offer off-the-shelf and custom ratios to meet your precision cleaning needs. Request a quote today.(plate) Hydrogen Fluoride (Hydrofluoric Acid) - US EPA(steel) Hydrogen Fluoride (Hydrofluoric Acid) 7664-39-3 . Hazard Summary . Hydrogen fluoride is used in the production of aluminum and chlorofluorocarbons, and in the glass etching and chemical industries. Acute (short-term) inhalation exposure to gaseous hydrogen fluoride can cause severe respiratory damage in humans, including

Hydrogen Fluoride, Hydrofluoric Acid, and Fluorine

Hydrofluoric acid (chemical formula HF) is a solution of anhydrous hydrogen fluoride in water (typically 25%, 38 or 40%, 49%, 70%, or 79%) and is the form usually shipped by railcar or in smaller tanks, and is the form usually stored at a plant site.(plate) JPH0874079A - Method for pickling stainless steel with Selection of Stainless Steel for Hydrofluoric Acid HF(steel) The nitric acid concn. measured by the analytical method is controlled to 0.2-2.5mol/l and the calculated hydrofluoric acid concn. to 0.2-1.5mol/l, the ratio of HF to HNO3 is kept at 0.2-1.2, and the metallic ion concn. is controlled to 40g/l. A stainless steel is pickled by using such a pickling soln.(plate) Materials of Construction Guideline for Anhydrous (steel) Dec 27, 2004Materials of Construction Guideline for Anhydrous Hydrogen Fluoride UPDATED 12/27/04 LAST REVISION January 2000 EXPIRATION DATE 12/31/05 SECTION 2 MATERIALS SAFETY Hydrogen fluoride is an extremely hazardous material, in the liquid or vapor form. Prolonged exposure to even a few ppm can cause painful irritation. Proper selection of

Materials of construction - Eurofluor

ANHYDROUS HYDROGEN FLUORIDE (AHF) AND HYDROFLUORIC ACID SOLUTIONS (HF) Materials of construction page 6 of 25 2. MATERIALS 2.1. Metallic materials When a small AHF leak or diffusion mixes with moisture in the air it forms a highly corrosive aqueous HF acid. This will corrode both carbon steel and stainless steel very fast. The same effect(plate) NICKEL- CONTAINING ALLOYS in HYDROFLUORIC ACID, (steel) Nickel-Copper cast alloy 506 Corrosion by Hydrofluoric Acid Hydrogen fluoride is readily soluble in water over a wide concentration range, the water solutions being referred to as hydrofluoric acid. Commer-cially, this acid is marketed in concentrations from 30 to (plate) Products Honeywell Hydrofluoric Acid(steel) Aqueous HF 70% and 49% Solution. Our 70% and 49% aqueous HF grades are used in applications including stainless steel and titanium pickling, glass etching/frosting, quartz purification, chemical milling and rare metal processing. They are also used as a feedstock in the production of chemical derivatives.

Recommended Medical Treatment for Hydrofluoric Acid

Unless heated, dilute concentrations of HF acid in water (e.g., less than 40% HF) do not produce significant vapor concentrations. NOTE Persons unfamiliar with hydrofluoric acid often mistake it for, or confuse it with, hydrochloric acid. Although hydrofluoric acid (HF) and hydrochloric acid (HCl) have similar sounding names, the(plate) Safe Handling of Hydrogen Fluoride and Hydrofluoric Acid(steel) Safe Handling of Hydrogen Fluoride and Hydrofluoric Acid . Hydrogen Fluoride (HF) is a commonly used substance on campus, but a very dangerous one. As an anhydrous material, it is a colorless gas or fuming liquid. Anhydrous HF has a boiling point of 19.5°C or 67°F.(plate) Safe Handling of Hydrogen Fluoride and Hydrofluoric Acid(steel) acid digestion of minerals and soils, and the removal of oxide coatings from stainless steel (pickling). Additionally, dilute hydrofluoric acid is often found in common rust removers. This guidance document will help you understand its properties, the health hazards it poses, and how to

Safe Use of HF - Chemistry

Hydrofluoric acid etches glass, due to the strong bond formed between fluoride anions and the silicon molecules in glass. HF will also react with glazes, enamels, pottery, concrete, rubber, leather, many metals (especially cast iron) and many organic compounds. Hydrogen gas, which may pose an explosion hazard, is generated upon reaction with Selection of Stainless Steel for Hydrofluoric Acid HF(plate) Selection Stainless Steel For Handling Hydrochloric Acid HCl(steel) Selection Stainless Steel For Handling Hydrochloric Acid HCl Hydrochloric acid is classed as reducing acid and lacks the oxidising properties that stainless steel need to maintain their 'passive' corrosion resistant surface layer.(plate) Selection of Stainless Steel for Handling Hydrofluoric Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Hydrofluoric Acid is extremely aggressive and attacks most metals and glass. The approach to the selection of stainless steel is similar to that for hydrochloric acid. Commercially concentrated acid is around 40wt. %. Plastics are normally considered for handling hydrofluoric acid.

Selection of Stainless Steel for Hydrofl

what is hydrofluoric acidhow is hydrofluoric acid madeph of hydrofluoric acidhydrofluoric acid chemistryhazards of hydrofluoric acidconcentrated hydrofluoric acidwhere to get hydrofluoric acidwhere to buy hydrofluoric acid(plate) Selection of Stainless Steel for Hydrofluoric Acid HF(steel) Selection of Stainless Steel for Handling Hydrofluoric Acid HF. Hydrofluoric Acid is extremely aggressive and attacks most metals and glass. The approach to the selection of stainless steel is similar to that for hydrochloric acid. Commercially concentrated acid is around 40wt. %. Plastics are normally considered for handling hydrofluoric acid.(plate) Special Application Fume Hoods - Labconco(steel) Acid digestion hoods have PVC liners and Lexan sashes to resist etching by hydrofluoric acid. Floor-mounted hoods accommodate oversize apparatus. Perchloric acid hoods have washdown systems and either stainless steel or PVC liners to withstand acid exposure. Radioisotope Hoods have stainless steel one-piece liners.

Stainless Steel - EPS - Eco Pickled Surface

Stainless Steel does not use hydrochloric acid for pickling. It uses the even more hazardous hydrofluoric acid (HF) and nitric acid. That means stainless pickling lines must be dedicated to that product, so there are fewer lines and the cost is higher than pickling carbon steel. EPS pickling of stainless steel solves these problems.(plate) Stainless Steel Pickling Process Site Name(steel) IntroductionPickling with Nitric and Hydrofluoric AcidReaction Mechanism For IronConclusionIn stainless steel production process oxides are formed on the stainless steel surface during annealing and hot rolling. Under these oxides layers chromium is depleted and the steel has lost a significant amount of corrosion resistance. Thus removal of the oxide scale is necessary. Best performance and quality is reached by using chemical cleaning of the surface. This is done with an acid pickling process, where mixtures of hydrofluoric acid (HF), nitric acid (HNO3) or sulfuric acid (H2SO4) are used to removSee more on sustecHydrogen Fluoride Uses, Benefits, and Chemical Safety Facts(steel) Hydrogen fluoride is a colorless, corrosive gas or liquid made up of a hydrogen atom and a fluorine atom. When hydrogen fluoride is dissolved in water, it is called hydrofluoric acid. Hydrogen fluoride is an industrial raw material used in the manufacture of products including refrigerants, gasoline and aluminum.(plate) The design of plants for handling hydrofluoric acid(steel) Hazards Associated with Hydrofluoric Acid Hydrogen fluoride (HF) both in the anhydrous state and in solution in water is a very reactive chemical. It is not, however, particularly prone to reactions of explosive violence. The hazards in handling hydrogen fluoride are associated with its toxicity and its ability to produce severe burns. Con­

What is Hydrofluoric Acid (HF)? - Definition from Selection of Stainless Steel for Hydrofluoric Acid HF

Apr 11, 2016Hydrofluoric acid (HF) is an inorganic acid. It is a solution of hydrogen fluoride in water. Hydrofluoric acid is a colorless solution and highly corrosive. It is capable of dissolving many materials, particularly oxides. It is known as contact-poison for its devastating effects on human tissues.(plate) Which alloy is best for use in hydrofluoric acid applications(steel) Anhydrous hydrogen fluoride and hydrofluoric acid are widely used in the industrial applications. Hydrofluoric acid is used in pickling of stainless steels, acid processing wells, glass etching, development of aluminium fluoride, synthetic cryolite for aluminium development, production of fluorinated organics like aerosol propellants, special purpose solvents, plastics, refrigerants and Selection of Stainless Steel for Hydrofluoric Acid HF(plate)Selection of stainless steels for handling hydrofluoric Selection of Stainless Steel for Hydrofluoric Acid HF(steel) 9. Selection of stainless steels for handling hydrofluoric acid (HF) Introduction. Hydrofluoric Acid is extremely aggressive and attacks most metals and glass. The approach to the selection of stainless steels is similar to that for hydrochloric acid. Commercially concentrated acid is around 40wt. % Corrosion resistance of stainless steels

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