BS EN ISO 10308:2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Common features of porosity tests
6 Test specimens
7 Specific porosity tests
  7.1 Alizarin test
  7.2 Anthraquinone test
  7.3 Cadmium sulfide test
  7.4 Copper sulfate (Preece) test
  7.5 Copper sulfate (Dupernell) test
  7.6 Corrodkote test (CORR)
  7.7 Electrographic tests
  7.8 Ferrocyanide test
  7.9 Ferron test
  7.10 Ferroxyl test
  7.11 Flowers-of-sulfur porosity test
  7.12 Hot-water test
  7.13 Hydrogen sulfide or sulfur dioxide/hydrogen
       sulfide test
  7.14 Haematoxylin test
  7.15 Magneson test
  7.16 Nitric acid vapour test
  7.17 Oxine test
  7.18 Permanganate test
  7.19 Polysulfide test
  7.20 Porotest test
  7.21 Salt spray tests [neutral (NSS), acetic (AASS)
       and cuproacetic (CASS)]
  7.22 Sulfur dioxide test
  7.23 Sulfurous acid/sulfur dioxide vapour test
  7.24 Thiocyanate test
  7.25 Thioacetamlde test (TAA)
  7.26 Watch-case acetic acid test
  7.27 Watch-case sodium bisulfite test
Annex A (normative) Tables of porosity tests
Annex B (informative) Typical report and evaluation of
        porosity tests
Annex C (informative) Schematic representation of types
        of pore
Annex D (informative) Classification of discontinuities
        in metallic and other inorganic coatings
Annex E (informative) Classification of methods of
        testing coating porosity
Annex F (informative) Alphabetical list of tests by
        substrate and coating
Bibliography

Describes the methods for revealing pores and discontinuities in coatings of aluminium, anodized aluminium, brass, cadmium, chromium, cobalt, copper, gold, indium, lead, nickel, nickel-boron, nickel-cobalt, nickel-iron, nickel-phosphorus, palladium, platinum, vitreous or porcelain enamel, rhodium, silver, tin, tin-lead, tin-nickel, tin-zinc, zinc and chromate or phosphate conversion coatings (including associated organic films) on aluminium, beryllium-copper, brass, copper, iron, NiFeCo alloys, magnesium, nickel, nickel-boron, nickel-phosphorus, phosphor-bronze, silver, steel, tin-nickel and zinc alloy basis metal.

This International Standard reviews published methods for revealing pores (see ISO 2080) and discontinuities in coatings of aluminium, anodized aluminium, brass, cadmium, chromium, cobalt, copper, gold, indium, lead, nickel, nickel-boron, nickel-cobalt, nickel-iron, nickel-phosphorus, palladium, platinum, vitreous or porcelain enamel, rhodium, silver, tin, tin-lead, tin-nickel, tin-zinc, zinc and chromate or phosphate conversion coatings (including associated organic films) on aluminium, beryllium-copper, brass, copper, iron, NiFeCo alloys, magnesium, nickel, nickel-boron, nickel-phosphorus, phosphor-bronze, silver, steel, tin-nickel and zinc alloy basis metal.

The tests summarized in this International Standard are designed to react with the substrate when exposed, by a discontinuity, in such a way as to form an observable reaction product.

NOTE 1 Pores are usually perpendicular to the coating surface but may be inclined to the coating surface. They are frequently cylindrical in shape but may also assume a twisted shape (see Annex C).

NOTE 2 Porosity may vary in size from the submicroscopic, invisible using a light microscope, to the microscopic, visible from × 10 to × 1 000, to the macroscopic, visible to the naked eye.

NOTE 3 Porosity may be visibly indicated by discolouration of the coated surface.

NOTE 4 Porosity in a coating is not always detrimental. In microdiscontinuous chromium, for example, porosity or microcracking is beneficial and tests are conducted to indicate the pores.

NOTE 5 Results obtained from porosity tests, expressed in terms such as pores per square centimeter, are relative values associated with the specific test method used and the magnification used during examination. Annex B gives typical report criteria.