prov:value
| - For example, the vapor-deposited metal layer may be electrochemically treated with acidic solutions containing, for example, chromium, copper, tin, bismuth, or zinc-chromium mixtures, etc., to deposit chromium, tin, bismuth or zinc-chromium coatings over the vapor-deposited metal coating to improve properties such as oxidation resistance, etc., prior to application of the adhesion-promoting layer.
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