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See Chinese contents: GB/T 38933-2020 GB/T 38933-2020: Cold rolled steel sheet for automobile--Test method of phosphate conversion coatings
This Standard specifies the terms and definitions, sample treatment, test methods and test reports for phosphate conversion coatings of cold rolled steel sheet for automobile. This Standard applies to the determination of iron-based, zinc-based, zinc manganese-based, and zinc-manganese-nickel-based phosphate conversion coatings of cold rolled steel sheet for automobile before coating.
