ISO 1460-2020 pdf free download.Metallic coatings — Hot dip galvanized coatings on ferrous materials — Gravimetric determination of the mass per unit area.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Principle
The hot dip galvanized coating on a surface of known area is dissolved in inhibited acid and the resultant loss in mass is determined by weighing the sample before and after the coating is dissolved.
5 Stripping solution
Dissolve 3,5 g of hexamethylenetetramine in 500 ml of concentrated hydrochloric acid (ρ ≥ 1,18 g/ml).
Dilute this solution to 1 000 ml with distilled water.
6 Sampling
The method of sampling shall be agreed between the interested parties.
7 Procedure
Where necessary, the sample shall be degreased with an organic solvent that does not attack the hot dip galvanized coating and then dried.
Before stripping, the sample shall be weighed to an accuracy better than 1 % of the presumed coating mass.
The quantity of solution shall be measured so that at least 10 ml of solution are available for each square centimetre of the surface of the sample. The sample shall be completely immersed in the solution at room temperature and left until the coating has completely dissolved. The end of the dissolution process can be recognized by the cessation of the originally brisk evolution of hydrogen. The sample shall then be rinsed in running water and, if necessary, brushed to remove any loose substance which may be adhering to the surface, dipped in alcohol, quickly dried and again weighed to the accuracy indicated in the previous paragraph.
After weighing, the surface area A of the exposed surface shall be determined to an accuracy of 1 %.ISO 1460 pdf download.