Chromate-free passivates have become necessary to avoid the use of hexavalent chromium, which is now identified as a health hazard. Forthcoming legislation will increasingly restrict use. Replacements giving equivalent corrosion protection have been developed although they are not self healing. This means that corrosion can quickly occur in damaged areas such as during Barrel plating. The use of appropriate passivate sealers can improve this situation dramatically, enabling hexavalent chromium to be avoided. EIS and scribed salt spray testing are used to test these systems.
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