Cronak process explained

The Cronak process is a conventional chromate conversion coating process developed in 1933 by The New Jersey Zinc Company.^[1] 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.^[2] The process was patented in the United States on March 24, 1936 with USPTO number 2,035,380.^[3]

External links

• https://web.archive.org/web/20141211093127/http://www.innovateus.net/science/what-zinc-chromate-used

Notes and References

1. Book: Gregory Zhang, Xiaoge. Corrosion and Electrochemistry of Zinc. 12 December 2014. 1996. Springer Verlag Gmbh. 978-1-4757-9877-7. 16, 17.
2. May 28, 1936 . New Protective Zinc Coating Introduced . The Iron Age . 137 . 22 . 94 . 8 Mar 2023 . Internet Archive.
3. US . 2035380 . patent . Method of coating zinc or cadmium base metals . 1936-03-24 . 1936-03-24 . 1933-05-13 . 1933-05-13 . Ernest John Wilhelm . Ernest, John Wilhelm . The New Jersey Zinc Company.