ISO 2177:2003 PDF

Metallic coatings — Measurement of coating thickness — Coulometric method by anodic dissolution

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Title (English):

ISO 2177:2003

Metallic coatings — Measurement of coating thickness — Coulometric method by anodic dissolution

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 14
Publication date:: March 19, 2003
Edition:: ISO IS 2177 edition 3 version 1
ICS:: 25.220.40

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Description (English):

ISO 2177:2002 describes a coulometric method by anodic dissolution for measuring the thickness of metallic coatings. It is only applicable to conductive coatings. Typical combinations of coatings and substrates that can be tested by this method are given. Other combinations may be tested with electrolytes in current use, or new electrolytes may be developed for them but, in both cases, it is necessary to verify the suitability of the complete system. ISO 2177:2002 is also applicable to multi-layer systems, e.g Cu-Ni-Cr. It may be used to measure the thickness of coatings applied by various means, if due account is taken of special features such as the presence of an alloy layer. In some cases, the presence and thickness of diffusion layers can also be measured. It can also be used to measure the thickness of coatings on cylindrical specimens and wires.

Technical details

Technical committee: ISO/TC 107 - Metallic and other inorganic coatings
SKU: ISO 2177:2003

Abstract

Overview

ISO 2177:2003 defines a coulometric method by anodic dissolution for measuring the thickness of metallic coatings. The method is applicable only to conductive coatings and can be used on single- and multi-layer systems (for example Cu–Ni–Cr), cylindrical parts and wires. Thickness is determined from the electrical charge (coulombs) required to dissolve the coating in a defined cell area; the end-point is detected by a change in cell potential. Annexes list typical electrolytes and instrument types.

Keywords: ISO 2177, coulometric method, anodic dissolution, coating thickness measurement, metallic coatings, electrolyte.

Key Topics

Scope and applicability
- Conductive coatings only; multilayer systems and some diffusion/alloy layers can be measured.
- Typical coating/substrate combinations are listed; other combinations require validation of electrolyte and system suitability.
Principle
- Dissolve a well-defined area anodically and calculate thickness from charge (constant-current/time or integrated current).
Instrumentation
- Direct-reading and integrator-type instruments; proprietary devices often supplied with recommended electrolytes.
- Instruments must be checked against specimens of known thickness (agreement within ±5% recommended).
Electrolyte
- Must be chemically stable, wet the test area, dissolve the coating efficiently and give a detectable potential change at penetration.
- Typical electrolytes provided in Annex A; manufacturers may recommend specific solutions.
Factors affecting accuracy
- Coating thickness limits (accuracy reduced >50 µm and

Related standards

Mentioned in the description and other ISO standards

Overview

Keywords: ISO 2177, coulometric method, anodic dissolution, coating thickness measurement, metallic coatings, electrolyte.

Key Topics

Scope and applicability
- Conductive coatings only; multilayer systems and some diffusion/alloy layers can be measured.
- Typical coating/substrate combinations are listed; other combinations require validation of electrolyte and system suitability.
Principle
- Dissolve a well-defined area anodically and calculate thickness from charge (constant-current/time or integrated current).
Instrumentation
- Direct-reading and integrator-type instruments; proprietary devices often supplied with recommended electrolytes.
- Instruments must be checked against specimens of known thickness (agreement within ±5% recommended).
Electrolyte
- Must be chemically stable, wet the test area, dissolve the coating efficiently and give a detectable potential change at penetration.
- Typical electrolytes provided in Annex A; manufacturers may recommend specific solutions.
Factors affecting accuracy
- Coating thickness limits (accuracy reduced >50 µm and

ISO 2177:2003 PDF

Technical details

Abstract

Overview

Key Topics

Related standards

Abstract

Overview

Key Topics

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