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https://hoursfinder.com/a-hours/astm-b633-salt-spray-hours.html
Salt Spray Rating (hours) 8-10 microns 0.18+/-0.03 Black/Gold/Silver 240+ Pin Zinc Coating Zinc plate per ASTM B633-07, SC3 (Fe/Zn 12), Type II (Yellow) Thickness: 0.0007 +/-0.0002 Blind holes should be kept free of rust Port Tube Zinc Coating Zinc plate per ASTM-B 633.98, Class Fe/Zn 12, Clear Zinc Thickness: 0.0002 96hr salt
https://www.triangleoshkosh.com/resources/salt-spray-hour-data-sheet-on-electroplated-zinc/
Salt Spray Hour Data Sheet on Electroplated Zinc. This white paper outlines the ASTM requirements as stated in ASTM B633 for electrodeposited coatings of zinc on iron and steel. In accordance to this standard, there are six finish types and four thickness classes. each has their own corrosion requirement for minimum salt spray hours.
https://www.finishing.com/181/12.shtml
II says "colored chromate coatings" meeting 96 hours of salt spray, and III says "colorless chromate conversion coatings" meeting 12 hours of salt spray. Both should be finished according to ASTM B201 and tested according to ASTM B117 [affil. link to spec at Techstreet].
https://www.galvanizeit.com/uploads/ASTM-B-633-yr-13.pdf
approved in 1978. Last previous edition approved in 2011 as B633 – 11. DOI: 10.1520/B0633-13. 2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [email protected]. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website.
https://elsmar.com/elsmarqualityforum/threads/salt-spray-failure-question-astm-b-633-and-b-117.56193/
Aug 30, 2012 · Our supplier is not accepting our rejection based on the ideas that (1) handling the parts can negatively affect the SST (even though we wore gloves throught the whole process) (2) ASTM B 633 says that a salt spray test must be completed within 72 hours of the chromate curing.
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