1 Scope
This standard 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 in Table 1. Other combinations may be tested with electrolytes in current use (see Annex A), or new electrolytes may be developed for them but, in both cases, it is necessary to verify the suitability of the complete system.
This standard is also applicable to multi-layer systems, e.g Cu-Ni-Cr (see also 8.5).
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 (see 8.7).
Foreword i
1 Scope
2 Normative References
3 Definitions
4 Principle
5 Instrumentation
6 Electrolyte
7 Factors Affecting the Measuring Accuracy
8 Procedure
9 Expression of Results
10 Measurement Uncertainty
11 Test Report
Annex A (Informative) Typical Electrolytes
Annex B (Informative) Types of Instrument
1 Scope
This standard 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 in Table 1. Other combinations may be tested with electrolytes in current use (see Annex A), or new electrolytes may be developed for them but, in both cases, it is necessary to verify the suitability of the complete system.
This standard is also applicable to multi-layer systems, e.g Cu-Ni-Cr (see also 8.5).
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 (see 8.7).
Contents of GB/T 4955-2005
Foreword i
1 Scope
2 Normative References
3 Definitions
4 Principle
5 Instrumentation
6 Electrolyte
7 Factors Affecting the Measuring Accuracy
8 Procedure
9 Expression of Results
10 Measurement Uncertainty
11 Test Report
Annex A (Informative) Typical Electrolytes
Annex B (Informative) Types of Instrument
