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Cronak process

Chromate conversion coating process

Chromate conversion coating process

The Cronak process is a conventional chromate conversion coating process developed in 1933 by The New Jersey Zinc Company. It involves immersing a zinc or zinc-plated article for 5 to 15 seconds in a chromate solution, typically prepared from sodium dichromate and sulfuric acid. The process was patented in the United States on March 24, 1936 with USPTO number 2,035,380.

References

References

  1. Gregory Zhang, Xiaoge. (1996). "Corrosion and Electrochemistry of Zinc". Springer Verlag Gmbh.
  2. (May 28, 1936). "New Protective Zinc Coating Introduced".
  3. "Method of coating zinc or cadmium base metals".
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