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tarnish removal

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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
... including metallic contaminant removal, tarnish removal, oxide and scale removal, finishing, and coating processes. abrasive blast cleaning coating process electropolishing heat-resistant alloys passivation salt bath descaling stainless steel surface treatment tarnish removal...
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
... article discusses the procedures used for pickling nickel and nickel alloys. It discusses three different surface conditions for pickling these nickel alloys: bright annealed white surface requiring removal of tarnish by flash pickling; bright annealed oxidized surface requiring removal of a layer of...
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
... Abstract This article describes the methods for removing metallic contaminants, tarnish, and scale resulting from hot-working or heat-treating operations on nickel-, cobalt-, and iron-base heat-resistant alloys. It provides a brief description of applicable finishing and coating processes...
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
... Abstract This article reviews cleaning and finishing operations that have proven to be effective on titanium, its alloys, and semi-fabricated titanium products. It explains how to remove scale, tarnish films, grease, and other soils and how to achieve required finishes and/or improve wear and...
Book Chapter

By Peter J. Blau
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003242
EISBN: 978-1-62708-199-3
... been used successfully. Rub lightly with a cotton swab saturated with acetone, then ultrasonically clean in methanol for 60 s, and dry with a hot air blower. Use a good grade of nonspotting laboratory glass cleaner, rinse in hot water, and hot air dry. Because oxidation, tarnishing, and/or...
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
... Abstract This article describes the basic attributes of the most widely used metal surface cleaning processes to remove pigmented drawing compounds, unpigmented oil and grease, chips, cutting fluids, polishing and buffing compounds, rust and scale from steel parts, and residues and lapping...
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
... Cycle time, s 1 Cyanide dip NaCN, 7.5 g/L (1 oz/gal) Room temperature 30–60 2 Acid dip H 2 SO 4 , 3–5 vol% Room temperature 5–10 Fig. 1 Surface preparation required for removal of buffing compounds and tarnish before plating of copper alloys. If the buffing compound is hard...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003211
EISBN: 978-1-62708-199-3
.... Therefore, these hard-to-solder metals and alloys always require special consideration in order to provide reproducible soldering. A flux promotes solder wetting of the base metal by: Removing tarnish films from precleaned surfaces, thereby permitting the molten solder to react with the base...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
..., scale, tarnish, or discoloration can be removed from nickel and nickel alloys by mechanical methods such as grinding or abrasive blasting, or by chemical methods such as pickling. Conventional methods of cleaning with alkaline compounds, emulsions or solvents, or by vapor degreasing, may be employed...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001250
EISBN: 978-1-62708-170-2
... coating of electrodeposited tin provides beneficial properties, such as excellent solderability, ductility, softness, and corrosion or tarnish resistance. In this way, the stronger materials that are required for their engineering properties can be enhanced by the desirable properties of tin on their...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003157
EISBN: 978-1-62708-199-3
... . If low tarnish rates and low contact resistance are to be preserved, the gold content should not be less than approximately 70%. Table 3 Properties of gold metals used for electrical contacts Alloy Solidus temperature Electrical conductivity, %IACS Hardness, HR15T Tensile strength...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001224
EISBN: 978-1-62708-170-2
... (followed by an alkaline wash to clean off the emulsion). Buffed soft metals: Buffed or polished parts typically can be cleaned with an alkaline detergent but may require pH > 12. Brass and bronze tend to tarnish in solutions with pH > 10. Thus, emulsions have been widely used for buffed soft...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005670
EISBN: 978-1-62708-198-6
... precious metal use for biomedical applications. The noble metals include gold, platinum, palladium, ruthenium, rhodium, iridium, and osmium. For the purpose of this article, silver is also included, even though it has a tendency to tarnish in physiological oral environments and is therefore normally...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003247
EISBN: 978-1-62708-199-3
... polishing wheel, followed by immersion of the specimen in water, rinsing in ethanol or methanol, and drying in warm air, is often sufficient to remove this tarnish and reveal the true structure. Another technique involves use of a camel hair brush and liquid hand soap to remove the black etching product...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003997
EISBN: 978-1-62708-185-6
... forgings; removal of oxide from copper forgings Hydrochloric acid 40–90 vol% HCl (35% conc); bal H 2 O Room Removal of scale and tarnish from brass forgings; removal of oxide from copper forgings “Scale” dip A 40% conc HNO 3 ; 30% conc H 2 SO 4 ; 0.5% conc HCl; bal H 2 O Room Used with pickle...
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
... or more), the steel anode cages should be removed from the solution, because the galvanic cell set up between the steel and the cadmium anodes will accelerate chemical dissolution of the anodes when the current is off. When cadmium is plated from an acid solution, such as the fluoborate bath, ball...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006786
EISBN: 978-1-62708-295-2
... join ducts that carried hot (500 °C, or 930 °F) air from the compressor of a military jet engine. (a) The nuts were fragmented or severely cracked. (b) The fracture surfaces of the nuts were oxidized and tarnished; purple, blue, and golden-yellow colors were sometimes evident. (c) Scanning electron...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003147
EISBN: 978-1-62708-199-3
... resistance to atmospheric corrosion. Corrosion rates are typically <0.0025 mm/year (0.1 mil/year), with varying degrees of surface discoloration depending on the alloy ( Table 5 ). Nickel 200 will become dull and acquire a thin adherent corrosion film, which is usually a sulfate. A greater tarnish will...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001234
EISBN: 978-1-62708-170-2
... reducing waste and improving consistency of the process. Develop and maintain cleanliness of parts and media during the process Control pH, foam, and water hardness Wet surfaces Emulsify oily soils Remove tarnish or scale Control part color Suspend soils Control lubricity...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001303
EISBN: 978-1-62708-170-2
... 0.03–25 0.001–1.0 High electrical conductance; brilliant white appearance is tarnish and corrosion resistant Tin 5 HB Bright white 4–25 0.015–1.0 Corrosion resistant; hygienic applications for food and dairy equipment; good solderability Zinc 40–50 HB Matte gray 2–13 (a) 12–50 (d...