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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
... 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.a0001305
EISBN: 978-1-62708-170-2
... electrocleaning 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...
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
... acids have been 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...
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
... and 5 A/dm 2 (20 and 50 A/ft 2 ). Substituting potassium salts for sodium salts in the baths with higher metal concentration, up to 38 g/L (5 oz/gal) copper, can increase the allowable current density to 6 A/dm 2 (60 A/ft 2 ), with the penalty of lowering the cathode efficiency. The Rochelle baths...
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
... for removing rust and scale from ferrous mill products, 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...
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
... manufacturer instructions. Salt 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...
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
... 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, corrosion by halogens...
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
.... 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 is an effective first step in removing scale from heat-resistant alloys. The process is generally more expensive than...
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
... 1910.94(d) Respiratory protection 1910.133 Goggles or face shield 1910.134 Skin contact Impervious gloves and garments 1910.1000 Table A Salt bath descaling Burns Heat resistant gloves and garments 1910.132 Face shield 1910.133 Toxic gases Local exhaust ventilation 1910.134...
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
... 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 the hardened...
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
..., that form reducing agents at the cathode and oxidizing agents at the anode when electrically activated. Baths are usually operated at about 480 °C (900 °F), and although electrolytic salt baths can be used as a batch process, they are more suitable for continuous operations such as descaling of strip...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... alkaline-base salt baths. The salt baths operate at temperatures of 650 to 705 °C (1200 to 1300 °F) and must be used carefully according to the manufacturer's instructions. Salt bath descaling is done by a series of cycles through (a) the salt, (b) a water rinse, and (c) a sulfuric acid bath to remove...
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
... solution ( Ref 5 ) provides high throwing power. The solution composition is: Fluoboric acid 48%: 350 mL/L Tin fluoborate 50%: 46.2 mL/L Lead fluoborate 50%: 25.2 mL/L Proprietary additive: 20 mL/L Boric acid: 26 g/L Tin-lead salt No. 1: 2 g/L The optimum operating conditions are...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003184
EISBN: 978-1-62708-199-3
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001304
EISBN: 978-1-62708-170-2
... removal of all classes of these soils. The seven basic methods used for removing rust and scale from ferrous mill products, forgings, castings and fabricated steel parts are: Abrasive blasting (dry or wet) Tumbling (dry or wet) Brushing Acid pickling Salt bath descaling Alkaline...
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
... reaction stops. Caution should be taken to avoid any water getting into the bath, or a violent reaction will occur. When the workpiece is removed from the caustic, it is rinsed immediately with a jet of hot water in order to blast off the dissolved material and attached salt. In the molten salt bath room...
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
... wire must be used unless the forgings will be machined or passivated. Salt bath descaling followed by acid cleaning and brightening is an efficient method of removing scale. A typical procedure is detailed in Table 2 . Table 2 Cycle for sodium hydride (reducing) descaling of annealed stainless...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003203
EISBN: 978-1-62708-199-3
... hydrides. Titanium hydrides can also form. A lean and dilute exothermic atmosphere is relatively safe and economical. The surface scale formed in such an atmosphere can be removed by pickling or by salt bath descaling and pickling. Such an atmosphere, formed by burning fuel gas with air, contains about...
Book Chapter

Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001274
EISBN: 978-1-62708-170-2
... 50021 SS … … Phosphate coating performance in salt spray DIN 50942 … May 1987 Phosphating of metals: process fundamentals and test methods Italy UNI 4195 … … Magnetic method used to measure thickness of phosphate coatings UNI 4236 4, 5 … Qualitative testing for phosphate in...
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
... aqueous flux solutions on the surface of the incoming work. The addition of water as a fine spray to the surface of the flux may still be necessary at intervals to rejuvenate it. Compositions of two effective flux covers are given in Table 4 . The salt components of the various flux solutions given in...