Non-chrome Passivation Process on Iron and Steel
Chromate conversion coatings have been used for almost 100 years and generally considered to provide the best corrosion resistant as insurance against the failure of the secondary coating. However, with the advent of increasing environmental awareness in the metal finishing industry, the toxicity and carcinogenic nature of chromium-VI-based treatments have made their use undesirable, leading to the search for effective replacements. Among the most popular method used to protect iron and steel from corrosion, galvanised zinc coatings and then chromate conversion treatment have a special place, in both decorative and industrial applications. However, in order to avoid the toxic and carcinogenic effect of cyanide and chromate from electrodepositing and chromating, an environmentally friendly titanium salt based passivation process on steel was researched. The passivation solution comprises titanium salt, activator, complexing agent, oxidant and this chrome free treatment process produces an iridescent coating on steel, which is made up of Ti2O3 and makes the corrosion resistance of steel greatly improved.
passivation chromate titanium salt conversion coatings iron and steel
GUO Ruiguang WANG Xiaochang FENG Qiang
Key Lab of Water, Environment and Ecology in North China, MoE, Xian Univ. of Arch. & Tech., Xian, China, 710055
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）