BS EN ISO 10309:2016 pdf free

BS EN ISO 10309:2016 pdf free.Metallic coatings一Porosity tests一 Ferroxyl test
This International Standard specifies a method of re-vealing pores or other discontinuities, when testing metallic coatings, that are not visibly affected by ferricyanide and chloride ions during the test period and that are cathodic to iron and steel. This method is especially useful for thick, hard chromium coatings used for wear resistance.
NOTE 1 With some coating materials a very thin layer is dissolved by the sodium chloride solution during a 10 min-ute application period (see 5.2.3). The impact of such dis-solution is that potential porosity, i.e. pores that have been covered over by very thin layers, are sometimes re-exposed.Experience has shown that such potential porosity is fre-quently re-exposed during actual service.
The following standard contains provisions which,through reference in this text, constitute provisions of this International Standard. At the time of publi-cation, the edition indicated was valid. AIl standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re-cent edition of the standard indicated below. Mem-bers of IEC and ISO maintain registers of currently valid International Standards.
ISO 3696: 1987. Water for analytical laboratory use一Specification and test methods.
The paper used to prepare the test strips must be free of any iron contamination. This may be verified by first immersing
the paper in sodium chloride solution,blotting, and then immersing the paper in the potass-ium hexacyanoferrate (III) solution. lron contamination will be evidenced by blue markings or spots, or a slight change or reduction in the white appearance of the dried paper when compared with the untreated paper.
Immerse strips of a suitable paper, for example “wet strength” filter paper, in the sodium chloride or sodium chloride-gelatin solution (see 4.2.1) until they have been thoroughly wetted by the solution. Re-move the strips and allow any excess solution to drain for about 1 min.BS EN ISO 10309 free free download.