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acid descaling

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Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001305
EISBN: 978-1-62708-170-2
...Abstract Abstract Passivation; pickling, that is, acid descaling; electropolishing; and mechanical cleaning are important surface treatments for the successful performance of stainless steel used for piping, pressure vessels, tanks, and machined parts in a wide variety of applications...
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
...Procedure for sodium hydride descaling and acid pickling of heat-resistant alloys Table 3 Procedure for sodium hydride descaling and acid pickling of heat-resistant alloys Operation Time Temperature Solution (a) Concentration, vol % (a) °C °F Sodium hydride descale 1–2 h...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003220
EISBN: 978-1-62708-199-3
... performance of stainless steel. This article describes the surface treatment of stainless steels including abrasive blast cleaning, acid pickling, salt bath descaling, passivation treatments, electropolishing, and the necessary coating processes involved. It also describes the surface treatment of heat...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005777
EISBN: 978-1-62708-165-8
... least expensive process to remove cutting fluids and polishing and buffing compounds Marginally effective against pigmented compounds. May require hand slushing and manual brushing to remove all traces of pigment Alkaline descaling: More costly, slower than acid pickling. No metal is lost...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003220
EISBN: 978-1-62708-199-3
... of stainless steel. This article describes the surface treatment of stainless steels including abrasive blast cleaning, acid pickling, salt bath descaling, passivation treatments, electropolishing, and the necessary coating processes involved. It also describes the surface treatment of heat-resistant alloys...
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
... practices. acid pickling batch pickling continuous pickling descaling electrolytic pickling hydrochloric acid inhibitors pickling pickling defects pickling equipment precleaning safety practices scale removal spent pickle liquor disposal steel sulfuric acid OXIDE SCALE must...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001221
EISBN: 978-1-62708-170-2
... can cause carbide precipitation in unstabilized stainless steels Properties of heat treated workpieces may be impaired if their tempering temperature is below that of the salt bath Subsequent acid cleaning is usually required to neutralize remaining salts, complete the descaling, and brighten...
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
... Copper Diffusion Vapor Degreasing Other Cleaning Methods Belt Grinding Abrasive Blast Cleaning Techniques Molten Salt Descaling Baths High-Temperature Salt Baths Low-Temperature Baths Aqueous Caustic Descaling Baths Acid Pickling Mass Finishing (Barrel Finishing...
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
... preliminary treatments also are helpful in specific instances, particularly for cast aluminum parts. One of these pretreatments entails etching the castings for 20 s in an alkaline solution at 82 °C (180 °F) and then dipping them for 2 to 3 s in a solution consisting of (by volume) 3 parts nitric acid (36...
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 provide uniform acid attack. The soils must be removed before heat treatment and joining to prevent contamination and consequent loss of ductility. Mechanical descaling methods such as sandblasting, shot blasting, and vapor blasting are used to remove hot work scales and hard lubricants from zirconium...
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
.... One procedure for removing heavy scale involves subjecting the parts to liquid abrasive blasting or salt-bath descaling after degreasing. These treatments are usually followed by pickling in nitric-hydrofluoric acid for the removal of light scale. When salt-bath descaling is used, oxide removal can...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003213
EISBN: 978-1-62708-199-3
..., forgings, castings, and fabricated metal parts are: Abrasive blasting (dry or wet) Tumbling (dry or wet) Brushing Acid pickling Salt bath descaling Alkaline descaling Acid cleaning The most important considerations in selecting one of the previous methods are: Thickness...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003213
EISBN: 978-1-62708-199-3
... pickling Salt bath descaling Alkaline descaling Acid cleaning The most important considerations in selecting one of the previous methods are: Thickness of rust or scale Composition of metal Condition of metal (product form or heat treatment) Allowable metal loss Surface...
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
...Time required to plate 2.54 μm (100 μin) of 80Sn-20Pb from high-speed methane sulfonic acid (MSA) solution Table 1 Time required to plate 2.54 μm (100 μin) of 80Sn-20Pb from high-speed methane sulfonic acid (MSA) solution Total metal content Time required at indicated current density...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004203
EISBN: 978-1-62708-184-9
... and application of materials in this industry, and current issues relative to pharmaceutical equipment construction, warrant closer examination. Materials Passivation Electropolishing Rouging References References 1. “Standard Practice for Cleaning, Descaling, and Passivation of Stainless...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004103
EISBN: 978-1-62708-184-9
... ratio of 1.5 and the other a chromium/iron ratio of only 0.2. This difference arises from the use, or nonuse, of nitric acid in descaling the strip. If the strip is descaled using a nitric-hydrofluoric acid bath, the chromium/iron ratio will be high. If the strip is grit blasted or descaled...
Series: ASM Handbook
Volume: 13C
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v13c.a0004202
EISBN: 978-1-62708-184-9
... organic acids with low pH, moderately to highly concentrated chloride from salt, and the high temperature at which some foods are processed. When selecting materials of construction for food- and beverage-processing equipment, all these factors should be considered and evaluated. In the food...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003992
EISBN: 978-1-62708-185-6
.... Barrel finishing (tumbling) is sometimes used for descaling. Acid pickling is recommended after tumbling. Wire brushing is sometimes used for removing scale from a few forgings. Brushes with stainless steel wire must be used unless the forgings will be machined or passivated. Salt bath descaling...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001309
EISBN: 978-1-62708-170-2
...Pickling conditions for copper-base materials Table 1 Pickling conditions for copper-base materials Constituent or condition Amount or value Sulfuric acid bath Sulfuric acid (a) 15–20 vol% 35% hydrogen peroxide 3–5 vol% Water bal Temperature of solution Room...