THE COMPOSITION AND PROTECTIVE PROPERTIES OF CHROMATE CONVERSION COATINGS ON MAGNESIUM

Authors
SIMARANOV AY MARSHAKOV AI MIKHAILOVSKII YN
Citation
Ay. Simaranov et al., THE COMPOSITION AND PROTECTIVE PROPERTIES OF CHROMATE CONVERSION COATINGS ON MAGNESIUM, Protection of metals, 28(5), 1992, pp. 576-580
Citations number
8
Categorie Soggetti
Metallurgy & Mining
Journal title
Protection of metals → ACNP
ISSN journal
00331732
Volume
28
Issue
5
Year of publication
1992
Pages
576 - 580
Database
ISI
SICI code
0033-1732(1992)28:5<576:TCAPPO>2.0.ZU;2-O
Abstract
It has been established 1! that chromate conversion coatings (CCC) on magnesium have the following structure: directly on the metal surface is a dense layer of Mg(II) and Cr(III) hydroxides whose upper surface is covered by a porous layer of Cr(OH)3. This latter layer forms as a result of the selective dissolution of Mg(OH)2 from the dense layer. It has been shown that an increase in the thickness of the dense layer inhibits the corrosion of magnesium in chloride solutions.