BS EN ISO 9717:2017 pdf free.Metallic and other inorganic coatings - Phosphate conversion coating of metals. BS EN ISO 9717 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 (see Annex B). 2 Normative references The following documents, in whole or in part, are...