| 摘要 |
An aqueous acidic solution and process for treating metal surfaces, particularly zinc and zinc alloy surfaces, to impart improved corrosion resistance thereto. The solution contains effective amounts of chromium ions substantially all of which are in the trivalent state, hydrogen ions to provide a pH of about 1.5 to about 2.2, an oxidizing agent, iron ions in combination with at least one additional metal ion selected from the group consisting of cobalt, nickel, molybdenum, manganese, lanthanum and mixtures thereof. The treating solution may optionally further contain halide ions and a wetting agent.
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