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 normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 2080 , Metallic and other inorganic coatings — Surface treatment, metallic and other inorganic coatings — Vocabulary
ISO 3892 , Conversion coatings on metallic materials — Determination of coating mass per unit area — Gravimetric methods
ISO 4519, Electrodeposited metallic coatings and related finishes — Sampling procedures for inspection by (Ittrthutes
ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
6 Requirements
6.1 Appearance
Zinc phosphate, zinc calcium phosphate and manganese phosphate coatings shall evenly cover the metal surface and shall not show any white stains, corrosion products or fingerprints.
NOTE Slight fluctuations in the appearance of phosphate coatings because of contact with frames, properties of the base material or through minor contact inside the drum do not constitute any reason for claim.
6.2 Coating mass per unit area
The coating mass is measured in accordance with the procedures specified in Iso 3892.
6.3 Post treatments
Untreated phosphate coatings do not provide a corrosion protection. A suitable after-treatment can effect a temporary protection. Table 2 shows the symbols when post-treatments are required.
6.4 Correlation of coating thickness and area-related mass
The thickness and the related mass in gram per square metre can be measured according to the following methods:
— magnetic inductive, according to ISO 2178;
— dissolving method, according to ISO 2177;
— x-ray according to ISO 3497.
7 Heat treatment
Heat treatment after the phosphating is not recommended, because the phosphate layer will be damaged at a temperature higher than 120 °C.
A neutral salt spray (NSS) test in accordance with Iso 9227 NSS is the standard test for determining corrosion resistance. If required, other test methods may be agreed between the contracting parties. The test should be performed with original components.
Where it is not possible to carry out the test on the actual item, special test panels can be used. If special test specimens are used to represent the coated articles in a test, the specimens shall be of the same nature, same surface condition, and same material and in the same metallurgical condition as the article they represent, and shall be placed in the same production lot of, and be processed along with, the coated article they represent. Original components or test plates can he used either for testing the coating systems.
1’he salt spray test provides a means of controlling for the quality and continuity of coating.
The test panels shall measure 150 mm x 100 mm (see Ftgur A.1). Two holes of diameter 5 mm and lightly countersunk on each side shall be drilled at 6 mm from each edge near adjacent corners at the ends of a 100 mm side, to enable the specimens to be suspended vertically during the test. All cut edges and corners shall be lightly rounded off and smoothed.BS EN ISO 9717:2017 pdf free download.