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hydrofluoric acid

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Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004182
EISBN: 978-1-62708-184-9
...Corrosion of selected metals and alloys in boiling 48% hydrofluoric acid Table 1 Corrosion of selected metals and alloys in boiling 48% hydrofluoric acid Exposure for 40 days; vapor phase purged with nitrogen Metal Corrosion rate Immersed Vapor mm/yr mils/yr mm/yr mils/yr...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003821
EISBN: 978-1-62708-183-2
... settings. The corrosive media include: hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, hydrobromic acid, nitric acid, organic acids, salts, seawater, and alkalis. The modes of high-temperature corrosion include oxidation, carburization, metal dusting, sulfidation, nitridation...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0005650
EISBN: 978-1-62708-177-1
... and procedures for handling concentrated and dilute hydrofluoric acid. The article concludes with a discussion on the precautions to be followed in the event of spills and cleanup. References References 1. “OSHA's Hazard Communication Standard,” 29CFR 1910.1200, Code of Federal Regulations , Vol 29...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006489
EISBN: 978-1-62708-207-5
... the alkaline etching and acid etching of aluminum. Alkaline etching reduces or eliminates surface scratches, nicks, extrusion die lines, and other imperfections. Acid etching can be done without heavy smut problems, particularly on aluminum die castings. Hydrochloric, hydrofluoric, nitric, phosphoric, chromic...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001229
EISBN: 978-1-62708-170-2
.... , Determination of Free Hydrofluoric and Nitric Acid in Stainless Steel Pickling Baths , Analyst , Vol 112 , 1987 , p 71 10.1039/an9871200071 12. Burdick J.K. , Meneghelli B.J. , and Fletcher K.S. III , On-Line Determination of Hydrogen Fluoride in a Mixed Acid Stainless Steel...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001307
EISBN: 978-1-62708-170-2
... 370–390 700–730 Sodium hydroxide … Quench 15–30 s Not heated Not heated Water … Neutralizing rinse 1–3 min RT to 60 RT to 140 Sulfuric acid 2–10 Brightening pickle 5–15 min 54–60 130–140 Hydrofluoric acid Nitric acid 2–4 15–20 Rinse 15–30 s Not heated Not heated Water...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001312
EISBN: 978-1-62708-170-2
... bath descaling is accomplished by a series of cycles through the salt, a water rinse, and a sulfuric acid bath to remove scale before final pickling. Metal removal by a chemical bath of nitric-hydrofluoric acid is used most commonly, although other baths have been used. The usual bath for zirconium...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... to 3 s in a solution consisting of (by volume) 3 parts nitric acid (36 °Bé) and 1 part hydrofluoric acid at 21 to 24 °C (70 to 75 °F). The principle of barrel burnishing is to cause surface metal to flow, rather than to remove metal from the surface. Burnishing compounds must have lubricating...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... °Bé) and 1 part hydrofluoric acid at 21 to 24 °C (70 to 75 °F). The principle of barrel burnishing is to cause surface metal to flow, rather than to remove metal from the surface. Burnishing compounds must have lubricating qualities. Soaps made especially for burnishing are usually used. They are readily...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001311
EISBN: 978-1-62708-170-2
...Corrosion of titanium in sulfuric acid pickle baths Table 2 Corrosion of titanium in sulfuric acid pickle baths A nitric-hydrofluoric acid solution, which is the final stage brightening in most alloy cleaning lines, should be maintained at a minimum ratio of 15 parts nitric acid to 1 part...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003782
EISBN: 978-1-62708-177-1
... prepared using an electropolishing process in nitric acid and subsequent heat tinting revealing a β-quenched structure in zirconium ( Ref 2 ). In 1948, Roth described a procedure involving mechanical polishing and hydrofluoric acid etching ( Ref 3 ). Hydrofluoric acid, being one of the few acids...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003220
EISBN: 978-1-62708-199-3
.... An alternative method of removing scale from stainless steels and heat-resisting alloys is by immersion in an aqueous solution containing about 10 vol% nitric acid and 1 to 2 vol% hydrofluoric acid. This solution should be used at a maximum temperature of 60 °C (140 °F). The time required for pickling depends...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003220
EISBN: 978-1-62708-199-3
... be obtained through selection of abrasives and adjustment of pressures. Acid Pickling An alternative method of removing scale from stainless steels and heat-resisting alloys is by immersion in an aqueous solution containing about 10 vol% nitric acid and 1 to 2 vol% hydrofluoric acid. This solution...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003847
EISBN: 978-1-62708-183-2
... acid  Transportation and storage—all concentrations Blended chlorobutyl  Evaporators Blended chlorobutyl Three-ply linings Sodium hypochlorite (bleach) Unblended chlorobutyl Ferric chloride Blended chlorobutyl Hydrofluoric acid  Concentrations above 50% Unblended chlorobutyl...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003792
EISBN: 978-1-62708-177-1
... with a hydrofluoric acid, nitric acid, and water solution Fig. 13 The as-cast microstructure of a Ti-6Al-4V alloy showing the very large grain structure typical of cast metals. Etched with a hydrofluoric acid, nitric acid, and water solution ( Table 3 ) Fig. 14 A higher magnification...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001440
EISBN: 978-1-62708-173-3
... surface contamination caused by the die lubricant used in the wire drawing operation, in addition to cleaning the filler wire. Pickling in nitric-hydrofluoric acid solution is also used for cleaning. Fig. 3 Ratio of filler-metal (electrode) wire surface area to volume for various wire diameters...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001256
EISBN: 978-1-62708-170-2
... Boric acid, free H 3 BO 3 0.6 8.3 1.1 Hydrofluoric acid, free HF None … … (a) Equivalent Troubleshooting guide for tin alloy plating with methane sulfonic acid (MSA) solutions Table 2 Troubleshooting guide for tin alloy plating with methane sulfonic acid (MSA) solutions...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001313
EISBN: 978-1-62708-170-2
... particles may be removed with hydrochloric acid, or by the nitric-hydrofluoric acid cleaning process described later in this section. When thinner sections such as sheet or plate are subjected to abrasive blasting on one side for an extended length of time without being turned over, the thermal stress...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001310
EISBN: 978-1-62708-170-2
... changes. Moreover, when a hydrofluoric-sulfuric acid pretreatment and brief exposure to the chrome pickling solution are used, the modified chrome pickle treatment ( Fig. 6 ) involves no appreciable dimensional changes. Fig. 5 Dichromate treatment (chemical treatment No. 9; MIL-M-3171, Type III...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001227
EISBN: 978-1-62708-170-2
...% concentrated hydrofluoric acid, remainder water. The cleaning solution is best when maintained at temperatures of 50 to 65 °C (120 to 150 °F). After mechanical grinding, abrasive blasting, or alkaline cleaning, tantalum and niobium are cleaned further with an acid solution. This consists of 40 to 60 vol...