With new restrictions on the use of hexavalent chromium right around the corner, all chemical companies supplying the plating industry are looking for suitable replacements. Aldoa Co., Detroit, MI, now offers Aldokote ZN-3, a two-component solution that produces a bright and highly corrosion-resistant clear to slightly iridescent conversion coating, ideal for fasteners, supports and brackets.The coating formulation provides a bath that reportedly is simple to prepare, use and maintain, requiring no additional steps or secondary topcoats. Under mild agitation (either mechanical or solution circulation) and an immersion time of 30 to 60 sec., Aldokote ZN-3 can provide a protection of more than 120 hours of neutral salt-spray testing against the appearance of white corrosion, surpassing typical automotive and other industry specifications.
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