International Organization for Standardization (ISO)
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ISO 10308:2006
Scope
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.
ISO 10308:2006 Referenced Document
ISO 10289:1999 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
ISO 2080:1981 Electroplating and related processes; Vocabulary Trilingual edition
ISO 10308:2006 history
2006ISO 10308:2006 Metallic coatings - Review of porosity tests
1995ISO 10308:1995 Metallic coatings - Review of porosty tests