what is bare steel (except for the rust that is likely to appear). Going with clear will make it difficult to tell what is clear chromated zinc vs. The problem may not be with the chromate at all. In the case of castings you may get some out-gassing and/or bleeding from the porosity.Ī. A light yellow would be better than a clear. Surfaces to be painted should be ONLY lightly chromated.Ī heavy chromate will shear under paint and cause the paint to peel. Surfaces left-bare should be heavily chromated. Does plating make that big a difference knowing that it's going to be painted also? Mark HollenbeckĪ. Also, I found out that the casting is painted after plating. Our plater said that he would be willing to go thicker on the clear. Can anyone give me some direction on how to get the customer to accept going to clear. ![]() He is asking for more info on the difference between ASTM B633 Our plater would like to go to a clear zinc, but our customer is under the assumption that the clear will not do as good a job with corrosion resistance and salt spray life. We are getting poor coverage on the as-cast surface of some steel castings using a yellow Zinc chromate.
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