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BS EN ISO 10308:2006

Current
Current

The latest, up-to-date edition.

Metallic coatings. Review of porosity tests
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-01-2006

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.

Committee
STI/33
DevelopmentNote
Supersedes 93/507650 DC (09/2005) Supersedes 01/123542 DC. (02/2006)
DocumentType
Standard
Pages
42
PublisherName
British Standards Institution
Status
Current
Supersedes

ASTM A 239 : 2014 : REDLINE Standard Practice for Locating the Thinnest Spot in a Zinc (Galvanized) Coating on Iron or Steel Articles<sup>, </sup>
ISO 10309:1994 Metallic coatings Porosity tests Ferroxyl test
ISO 4526:2004 Metallic coatings Electroplated coatings of nickel for engineering purposes
IEC 60068-2-43:2003 Environmental testing - Part 2-43: Tests - Test Kd: Hydrogen sulphide test for contacts and connections
ASTM B 733 : 2015 : REDLINE Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal
ISO 14647:2000 Metallic coatings Determination of porosity in gold coatings on metal substrates Nitric acid vapour test
ASTM B 818 : 2003 : R2018 Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy<brk/>(UNS R31233) Plate, Sheet and Strip
ISO 2080:2008 Metallic and other inorganic coatings Surface treatment, metallic and other inorganic coatings Vocabulary
ISO 4541:1978 Metallic and other non-organic coatings Corrodkote corrosion test (CORR test)
ASTM B 380 : 1997 : R2007 Standard Test Method of Corrosion Testing of Decorative Electrodeposited Coatings by the Corrodkote Procedure
ASTM B 741 : 1995 : R2000 Standard Test Method for Porosity In Gold Coatings On Metal Substrates By Paper Electrography (Withdrawn 2005)
ASTM B 456 : 2017 : REDLINE Standard Specification for Electrodeposited Coatings of Copper Plus Nickel Plus<brk/> Chromium and Nickel Plus Chromium
UNI 4240 : 1959 SURFACE TREATMENTS OF METALLIC MATERIALS - POROSITY TEST OF ELECTROPLATED COATINGS ON FERROUS MATERIALS
ISO 4524-3:1985 Metallic coatings Test methods for electrodeposited gold and gold alloy coatings Part 3: Electrographic tests for porosity
ASTM B 545 : 2013 : REDLINE Standard Specification for Electrodeposited Coatings of Tin
ASTM B 735 : 2016 : REDLINE Standard Test Method for Porosity in Gold Coatings on Metal Substrates by Nitric Acid Vapor
ISO 1456:2009 Metallic and other inorganic coatings — Electrodeposited coatings of nickel, nickel plus chromium, copper plus nickel and of copper plus nickel plus chromium
ISO 3160-2:2015 Watch-cases and accessories — Gold alloy coverings — Part 2: Determination of fineness, thickness, corrosion resistance and adhesion
ISO 15720:2001 Metallic coatings Porosity tests Porosity in gold or palladium coatings on metal substrates by gel-bulk electrography
ISO 12687:1996 Metallic coatings Porosity tests Humid sulfur (flowers of sulfur) test
AS 2331.3.6-2001 Methods of test for metallic and related coatings Corrosion and related property tests - Electrographic porosity test
ASTM B 246 : 2015 : REDLINE Standard Specification for Tinned Hard-Drawn and Medium-Hard-Drawn Copper Wire for Electrical Purposes
AS 2331.3.4-2001 Methods of test for metallic and related coatings Corrosion and related property tests - Thioacetamide anti-tarnish and porosity test
ISO 15721:2001 Metallic coatings Porosity tests Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour
ISO 4538:1978 Metallic coatings Thioacetamide corrosion test (TAA test)
UNI 4524 : 1960 POROSITY TESTING OF ELECTROLYTIC COATINGS ON COPPER AND ITS ALLOYS
ISO 10062:2006 Corrosion tests in artificial atmosphere at very low concentrations of polluting gas(es)
ISO 9227:2017 Corrosion tests in artificial atmospheres — Salt spray tests
ISO 6158:2011 Metallic and other inorganic coatings Electrodeposited coatings of chromium for engineering purposes
ISO 2085:2010 Anodizing of aluminium and its alloys Check for continuity of thin anodic oxidation coatings Copper sulfate test
ASTM B 818 : 2003 : R2018 Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy<brk/>(UNS R31233) Plate, Sheet and Strip
AS 2331.3.5-2001 Methods of test for metallic and related coatings Corrosion and related property tests - Sulfur dioxide/hydrogen sulfide porosity tests
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 6988:1985 Metallic and other non organic coatings Sulfur dioxide test with general condensation of moisture
ISO 4525:2003 Metallic coatings Electroplated coatings of nickel plus chromium on plastics materials

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