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chromate-free conversion coatings

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870191
EISBN: 978-1-62708-299-0
..., and voltage/amperage control. Conversion Coatings Conversion coatings are adherent surface layers of low-solubility oxide, phosphate, or chromate compounds produced by the reaction of suitable reagents with the metallic surface. These coatings affect the appearance, electrochemical potential...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
... Abstract This chapter provides practical information on surface treatments that work by altering the surface chemistry of metals and alloys. It discusses the use of phosphate and chromate conversion coatings as well as anodizing, steam oxidation, diffusion coatings, and pack cementation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910363
EISBN: 978-1-62708-250-1
... Abstract Organic coatings (paints and plastic or rubber linings), metallic coatings, and nonmetallic inorganic coatings (conversion coatings, cements, ceramics, and glasses) are used in applications requiring corrosion protection. These coatings and linings may protect substrates by three basic...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 April 2021
DOI: 10.31399/asm.tb.tpsfwea.t59300335
EISBN: 978-1-62708-323-2
... for corrosion protection. Chromate conversion coatings are similar but differing chemical species, and they are mostly used for corrosion protection. The manganese phosphate coatings are specified by coating weight per unit area, but they are usually less than 50 μm in thickness. Manganese phosphate coatings...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350231
EISBN: 978-1-62708-315-7
.... A chromate conversion coating produced on magnesium alloys in a boiling solution of sodium dichromate. differential coating. A coated product having a specified coating on one surface and a significantly lighter coating on the other surface (such as a hot dip galvanized product or electrolytic tin plate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.9781627083157
EISBN: 978-1-62708-315-7
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030380
EISBN: 978-1-62708-282-2
... acid. Also called chromodizing or chromatizing. Not to be confused with chromating or chromizing. chromate treatment. A treatment of metal in a solution of a hexavalent chromium compound to produce a conversion coating consisting of trivalent and hexavalent chromium compounds. chromating. Performing...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.9781627082822
EISBN: 978-1-62708-282-2
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2013
DOI: 10.31399/asm.tb.mfub.t53740325
EISBN: 978-1-62708-308-9
.... Environmental Regulations Environmental protection regulations are often directly or indirectly related to finishing and coating processes. This is particularly true for solvent cleaning procedures, cadmium and chromium electroplating, chromate conversion coatings, and organic coatings containing high...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240323
EISBN: 978-1-62708-251-8
..., and carbon. Typical approaches to alleviating or minimizing pitting corrosion include the following: using defect-free barrier coatings; reducing the aggressiveness of the environment, for example, chloride ion concentrations, temperature, acidity, and oxidizing agents; using more resistant metals...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230459
EISBN: 978-1-62708-298-3
... in aqueous corrosion. Nitrate and chromate ions are comparatively innocuous unless present in amounts sufficient to substantially increase the conductivity of the water [ Darwin and Buddery 1960b ]. Cupric and ferric ions can exert a strongly corrosive effect. The normally passive beryllium oxide film...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350195
EISBN: 978-1-62708-315-7
... moderate protection Thermally sprayed zinc or aluminum for moderate protection Electrolytic zinc or zinc-nickel alloy (10–14% Ni) coating followed by chromate passivation and an organic topcoat Painting, with appropriate preparation and priming, perhaps zinc or aluminum loaded Cadmium plate...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ciktmse.t56080001
EISBN: 978-1-62708-460-4
... strong oxidizing properties with various metal surfaces, promoting oxide film growth to achieve surface passivation. Typically, Cr VI species are either directly used in the form of an inhibitor anion for corrosive media or commonly applied in the surface coating preparation (e.g., chromate conversion...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550141
EISBN: 978-1-62708-307-2
..., and mechanical properties of cast and wrought magnesium alloys. It also describes the processes used to produce magnesium parts, the causes and effects of corrosion, and the use of protective coatings and treatments. cast magnesium alloys corrosion protection corrosion resistance extrusion...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390100
EISBN: 978-1-62708-459-8
... lubricants (emulsions, synthetics, solutions); and a wide range of coatings and carriers. It also discusses solid-film lubricants (oxide films, polymer films, layer-lattice compounds) and environmental and safety concerns. aqueous lubricants coatings compounded lubricants greases metalworking...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2023
DOI: 10.31399/asm.tb.ciktmse.9781627084604
EISBN: 978-1-62708-460-4
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350011
EISBN: 978-1-62708-315-7
..., restricting the degree of movement, shot peening (rough surfaces are less prone to fretting damage), surface hardening (e.g., carburizing and nitriding), anodizing of aluminum alloys, phosphate conversion coating of steels, and by applying protective coatings by electrodeposition (e.g., gold or silver plating...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 1999
DOI: 10.31399/asm.tb.caaa.t67870045
EISBN: 978-1-62708-299-0
... also influential. Two-coat polyurethane paint systems experienced far fewer incidences of filiform corrosion than did single-coat systems. Filiform corrosion rarely occurred when bare aluminum was anodized using chromic acid or primed with chromate or chromate-phosphate conversion coatings. Because...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550193
EISBN: 978-1-62708-307-2
... finish, and this finish is particularly effective at infrared wavelengths. Beryllium can be plated with nickel, silver, gold, and aluminum, and the surface can be anodized or chromate conversion coated to provide a measure of corrosion resistance. Beryllium can be machined to extremely close...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290243
EISBN: 978-1-62708-306-5
... and reduced bond durability. However, it is possible to deposit a microscopic rough, adherent conversion coating on various steel surfaces. The formation of a suitable oxide layer on aluminum adherends is critical for long-term durability. There have been many instances of adhesively bonded aluminum...