| 摘要 |
A trivalent chromium protective coating composition for zinc or a zinc plated article having an acid pH of about 3.0 to 4.0 and a process for coating the zinc or zinc plated article in which the article is contacted with the composition and trivalent chromium is deposited on the article by electrolysis and an article of zinc or zinc plate is coated with a protective trivalent chromium composition.
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