BS EN ISO 9717:2017,Metallic And Other Inorganic Coatings—Phosphate Conversion Coating Of Metals (British Standard).
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This document specifies a process for the confirmation of requirements for phosphate coatings which are usually destined for application on ferrous materials, zinc, cadmium and their alloys.
Heat treatment after the phosphating is not recommended, because the phosphate layer will be damaged at a temperature higher than 120℃.
Determination of resistance of phosphate conversion coatings to neutra salt spray test without supplementary treatments or organic coatings.
Use the neutral salt spray test method (see IS0 9227) to provide a means of controlling the quality and continuity of the phosphate conversion coatings by a continuous moving moisture film. The test duration shall be specified by the user or purchaser.
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