BS EN ISO 9717-2016 pdf download.Metallic and other inorganic coatings一Phosphate conversion coating of metals.
There are other coating types of zinc phosphate, which are altered because of the build-in of iron and/or nickel and /or manganese. This altered metal is usually present as a double salt, like Zn2ME(PO4)2x 4 H20，whereby ME can be Fe(I), Ni or Mn. Zinc will continue to be the main metal part of those coatings, which do not have an own marking to avoid confusion. It should also be noted that metal taken from the basic material, is included in the conversion coating.
5.2 Designation of conversion coating
The designation of the conversion coating shall consist of the following information:
a) number of this standard;
b) followed by a hyphen;
c) designation of basic material; by means of the material chemical symbol [or the symbol of the primary
alloy components) (see Note 1);
d) followed by a solidus(/);
e) a symbol describing the type of coating;
1) solidus (I);
g) a symbol, which indicates the function of the conversion coating as follows:
— r = adhesion promoter and/or corrosion protection
— 2 = Simplification of cold forming
— g= Reduction of friction
— e = electrical insulation h) solidus (f);
i) a symbol, which indicates the surtace-relateci mass per square metre wirn a measurement uncertainty ol
+/.30%.
If the phosphate coating must receive a secondary treatment, the designation needs the following information:
a) solidus (/J
b) a symbol, which defines the conversion coating (see table 1). Repeat this process, if necessary.
It is recommended to let follow up the chemical symbol with the standard name of the basic material. 6 Requirements
6.1 Appearance
Zinc phosphate, zinc calcium phosphate and manganese phosphate coatings shall evenly cover the metal surface and may not show any white stains, corrosion products or fingerprints.
NOTE Slight fluctuations in appearance of phosphate coatings because olcontact with the frames, properties of the base material or through minor contact inside the drum, do not constitute any reason for claim.
62 Coating mass per unit area
The coating mass is measured in accordance with procedures specified in EN ISO 3892.
6.3 Corrosion resistance
Untreated phosphate coatings do not provide a corrosion protection. A suitable after treatment can effect a temporary protection. Table 2 gives symbols which shall be used by the customer when post treatments are determined.BS EN ISO 9717 pdf download.