Plating Zinc over Heat Treating
I am not able to plate zinc over an area that has been heat treated. Any suggestions?
Q. I am not able to plate zinc over an area that has been heat treated. Any suggestions? M.M.
A. Without any further information, it is extremely difficult to answer this question. The first question is what is the heat treat environment like (oxidizing, reducing or inert atmosphere)? Unless you have an inert or reducing atmosphere, you likely have a good deal of scale that may be built up on the part. This will require either acid cleaning or mechanical finishing for removal.
What is the quench method (air, oil or water)? The quicker the quench, the more likely you can shock off part of the contamination.
Were parts cleaned before heat treat? If not, an oily residue left behind prior to heat treating will create a surface that is extremely difficult to clean and may take a very long time in a strong acid to clean up. Depending on the heat treatment and the steel (assuming this is steel), you may also carburize the surface, possibly changing surface hardness. Parts should always be cleaned prior to heat treatment.
Related Content
-
Choosing and Troubleshooting Copper Electroplating Processes
Learn more on this inexpensive and highly efficient process.
-
Advantages to Pumped Eductor Agitation
Not all agitation methods are created equally. Pumped agitation with eductor nozzles can improve process tanks and quickly show a reduction in operating costs while keeping staff safe, following environmental legislation and preventing pollution.
-
How to Choose Between Sulfate and Chloride-Based Trivalent Chromium
There are several factors to consider when choosing between sulfate and chloride-based baths for trivalent chromium plating. Mark Schario of Columbia Chemical discusses the differences and what platers should keep in mind when evaluating options.