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chromic acid rinsing

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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
..., phosphating, rinsing after phosphating, and chromic acid rinsing. The article describes the techniques for controlling the chemical composition of various phosphating solutions. It discusses the equipment and factors that influence equipment requirements in immersion and spray systems. The article also...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
..., manganese phosphate coatings are usually black in appearance. The application of a phosphate coating as a base for subsequent painting normally comprises five successive operations: (a) cleaning, (b) rinsing, (c) phosphating, (d) rinsing, and (e) chromic acid rinsing. Some of these operations can...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003217
EISBN: 978-1-62708-199-3
... intensifies the coloring, manganese phosphate coatings are usually black in appearance. Process Details The application of a phosphate coating as a base for subsequent painting normally comprises five successive operations: (a) cleaning, (b) rinsing, (c) phosphating, (d) rinsing, and (e) chromic acid...
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
.... Various modifications can be made for specific conditions. If parts are precleaned in alkaline solutions, two water rinse tanks should precede the acid cleaning tank. One of these two rinses may be a still tank containing dilute chromic acid. The final may be a heated still tank containing dilute chromic...
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.a0001243
EISBN: 978-1-62708-170-2
.... Chromic acid wastes may be either recovered or destroyed, and the choice of process should be based on a comparison of initial costs, labor costs for operation and maintenance, chemical costs, space requirements, and utility costs. The volume of wastes and the value of the chromic acid and rinse water...
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
... buildup. (d) Do not allow surface to dry out before rinsing. (e) Limited solubility regulates fluoride. (f) Add 0.2% calcium chromate if fluoride is too high. (g) Correct pH with additions of sodium hydroxide or chromic acid. (h) Fortify bath by additions of sodium dichromate...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001244
EISBN: 978-1-62708-170-2
... chromium plating baths Table 2 Compositions and operating conditions for two chromium plating baths Constituent or condition General decorative bath Bright, crack-free bath Chromic acid 250 g/L (33.0 oz/gal) 260–300 g/L (35–40 oz/gal) Ratio of chromic acid to sulfate 100:1 to 125:1...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001281
EISBN: 978-1-62708-170-2
... in slightly acidified hot water. One specific sealing solution contains 1 g of chromic acid in 100 L of solution (0.1 oz in 100 gal). The sealing procedure consists of immersing the freshly anodized and rinsed part in the sealing solution at 79 ± 1 °C (175 ± 2 °F) for 5 min. The pH of this solution...
Series: ASM Handbook
Volume: 2A
Publisher: ASM International
Published: 30 November 2018
DOI: 10.31399/asm.hb.v02a.a0006511
EISBN: 978-1-62708-207-5
... Electrobrightening Sulfuric-Phosphoric-Chromic Acid Electrobrightening Among the various types of concentrated baths, phosphoric-nitric acid baths are the most widely used in the United States. Compositions and operating conditions for this type of bath are: Constituent or condition Range...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001308
EISBN: 978-1-62708-170-2
... s of the cleaning operation. After removal from the cleaner, the work is rinsed in warm or hot water, dipped in acid to neutralize any residual alkali, and finally rinsed in cold water. The work can then be finished as desired. The composition of two solutions that are recommended...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... for chromic acid anodizing Table 5 Sequence of operations for chromic acid anodizing Operation Solution Solution temperature Treatment time, min °C °F Vapor degrease Suitable solvent … … … Alkaline clean Alkaline cleaner (a) (a) (a) Rinse (b) Water Ambient Ambient...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... from the bath within 15 s, rinsed, and sealed. The basic operations for this process are the same as for the chromic acid process. Parts or assemblies that contain joints or recesses that could entrap the electrolyte should not be anodized in the sulfuric acid bath. The concentration of sulfuric...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003247
EISBN: 978-1-62708-199-3
... NaOH, 5 g NaF, 93 mL water Immerse for 2 to 3 min. 12 50 mL Poulton's reagent (etchant 4 in Table 1 ), 25 mL HNO 3 (conc), 40 mL of solution of 3 g chromic acid per 10 mL of water Put a few drops on as-rolled or as-extruded surface for 1 to 4 min, rinse, and swab to desmut. Examine...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003247
EISBN: 978-1-62708-199-3
... wettability. After precleaning, rinse in cold water and immediately immerse in etchant for 30 s. 11 2 g NaOH, 5 g NaF, 93 mL water Immerse for 2 to 3 min. 12 50 mL Poulton's reagent (etchant 4 in Table 1 ), 25 mL HNO 3 (conc), 40 mL of solution of 3 g chromic acid per 10 mL of water Put a few...
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
... in single stage, vapor slush degrease (b) Boiling alkaline, blow off, hand wipe Vapor slush degrease, hand wipe Acid clean (c) Hot emulsion hand slush, spray emulsion in single stage, hot rinse, hand wipe Hot alkaline soak, hot rinse (hand wipe, if possible), electrolytic alkaline, cold water rinse...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003827
EISBN: 978-1-62708-183-2
... that of anodized beryllium. At elevated temperature in air, unprotected beryllium oxidizes at rates greater than 100 times that of anodized beryllium. Chromic acid/nitric acid anodic coatings have been found to protect beryllium effectively in environments for the following times ( Ref 3 ): No evidence...
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
... MIL-G-5634 Type III Room temperature Adjust pressure to part fragility Aluminum Immersion Chromic acid solution, 360–480 g/L (3–4 lb/gal) 74 ± 3 165 ± 5 Maximum allowable immersion time is 15 min. Water rinse parts as soon as possible on removal from solution. Chromic acid plus nitric...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001247
EISBN: 978-1-62708-170-2
... Ammonium nitrate 105–136 14–18 10–20 2 (c) Hydrochloric acid (1.18 sp gr), undiluted … … 10–20 Antimony trioxide 15 2 … 3 Chromic acid 203 26.8 5–10 Sulfuric acid (95%) 48 (d) 6.4 (e) … 4 Ammonium persulfate 51 6.7 5–10 Ammonium hydroxide 96.8 (d) 12.8 (e...
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...