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salt bath descaling

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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.a0001307
EISBN: 978-1-62708-170-2
... porosity or inclusions that are a result of pickup from the tumbling process. Wire Brushing Wire brushing is sometimes used to remove very light scale or surface discoloration. All brushes used on heat-resistant alloys must have stainless steel bristles. Salt-Bath Descaling Salt-bath...
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
... of sulfamic, phosphoric, sulfuric, or hydrochloric acid Scale Complete removal of scale from mill products and fabricated parts Electrolytic pickling removes scale twice as fast. Salt bath descaling: Bath operates within temperatures of 400 to 525 °C (750 to 975 °F) Several...
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
... Etching Phosphoric acid is often used as an etchant for nonferrous metals (such as copper, brass, aluminum, and zinc) to enhance paint adhesion. A detergent-bearing iron phosphating solution is often ideal for this sort of combined cleaning and etching approach. Molten Salt Bath Cleaning...
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
... 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 be hastened by removing...
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
... contamination and cold-worked layer and to produce a smooth, bright finish. Chemical Descaling Some scale, as well as forming lubricants, can be removed by proprietary water solutions of strong caustic compounds, or by the use of molten alkaline-based salt baths. The salt baths operate at temperatures...
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
... safe procedure during the working of titanium materials. Generally, a heavy oxide layer resulting from hot working of the metal is removed by grit blasting or other mechanical means, or by salt bath descaling. After removal of the scale, further mechanical or chemical treatment is applied to remove...
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
... electroplating electropolishing emulsion cleaning finishing flame hardening grinding ion implantation laser surface processing mechanical cleaning nitriding painting passivation salt bath descaling solvent cleaning stainless steel surface blackening surface modification surface treatment terne...
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
..., and the electrolytic salt bath is operated with the work at a negative or reducing polarity. Cycles are usually developed through experience and may vary from 15 to 30 min, followed by water rinsing and drying. Reducing Process The reducing or sodium hydride descaling process is performed in a fused caustic...
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
... used in batch pickling, often by adding rock salt (NaCl) to a sulfuric acid pickling bath. Such practices might be expected to give the bright, pickled steel surface characteristics associated with hydrochloric acid and to increase pickling rates, but not without some drawbacks. The proportion of HCl...
Book Chapter

By J.R. Keough
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005820
EISBN: 978-1-62708-165-8
... in the quenching of ferrous materials is covered in this article. Salts are also used for descaling, processing of nonferrous materials, nitriding, and removing various coatings and ceramic shell material. Molten salts are usually the medium of choice for high-temperature quenching. Examples are: Isothermal...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001314
EISBN: 978-1-62708-170-2
... saturated with metal salts. Fresh solution should be made up only when salts begin to crystallize on the side of the bath container. Alloy Groups For the purpose of discussing pickling procedures, the nickel alloys can be divided into four groups: High-nickel alloys such as Nickel 200, Nickel...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
.... Acid Cleaning Acid cleaning may be used alone or in conjunction with other acid, alkaline, or solvent cleaning systems. Vapor degreasing and alkaline cleaning may be required for removal of heavy oils and grease from workpieces before they are immersed in an acid bath. One of the main functions...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005778
EISBN: 978-1-62708-165-8
... composition, and case depth, and presents examples that relate dimensional change to several shapes that vary in complexity. It also provides information on the quenchant removal and salt removal processes, lists the applications of liquid carburizing in cyanide baths, and discusses the process and importance...
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
... in the bath Analyze for carbon and treat if necessary. Copper contamination in the bath Check and do low-current dummy plating if necessary. Incorrect alloy composition Check and adjust. Insufficient/poor cleaning of base metal Check parts going out of descale. Check descale and activator...
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
... salt. In the molten salt bath room, a suction hood or other ventilation system should be installed. The operator should use a control in a separate room or be separated from the bath container by a partition. In the vicinity of the bath container, the operator should wear a respirator, a face...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001242
EISBN: 978-1-62708-170-2
... are proprietary but typically contain an organic complexing agent, buffer salts, anode depolarizer, and proprietary addition agents. Alkaline Copper Pyrophosphate Baths Alkaline copper pyrophosphate baths are used for decorative multiplate applications including plating on plastic, plating through-holes...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003593
EISBN: 978-1-62708-182-5
... used aluminum beverage cans, the Hall-Heroult aluminum electrowinning cell with a fluoride (cryolite)-base electrolyte, nitrate/nitrite heat-exchange salts, and fused salt descaling or heat treatment baths. In other important engineering systems, the accelerated corrosion of materials results from...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001273
EISBN: 978-1-62708-170-2
... coils of low-carbon steel in ribbon form first through appropriate cleaning and tinning baths and then through a stream of molten babbitt, which is gravity cast on the moving strip. The strip is immediately water-chilled from below. After excess babbitt is removed, the stock is recoiled and is ready...
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
... material may need a bright dip or color dip after pickling. 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...