1 Scope
This standard reviews methods for measuring the thickness of metallic and other inorganic coatings on both metallic and non-metallic substrates (see Tables 1, 2 and 3). It is limited to tests already specified, or to be specified, in national standards, and excludes certain tests that are used for special applications.
Table 1 Methods of measuring coating thickness
Non-destructive Destructive
Split-beam microscope (light section) (GB/T 8015.2a) Microscopical (optical) (GB/T 6462)
Magnetic (GB/T 4956 and GB/T 13744) Fizeau multiple-beam interferometry (ISO 3868b)
Eddy current (GB/T 4957) Profilometric (stylus) (GB/T 11378b)
X-ray spectrometric (GB/T 16921) Scanning electron microscope (ISO 9220)
Beta backscatter (ISO 3543) Dissolution methods:
Gravimetic strip and weigh method and gravimetric analytical method (ISO 10111) Coulometric method (GB/T 4955)
a Can be destructive in some applications.
b Can be non-destructive in some applications.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated references, the latest edition applies.
GB/T 4955 Metallic coatings—Measurement of coating thickness—Coulometric method by anodic dissolution (idt ISO 2177)
GB/T 4956 Non-magnetic coatings on magnetic substrates—Measurement of coating thickness—Magnetic method (ISO 2178, IDT)
GB/T 4957 Non-conductive coatings on non-magnetic basis metals—Measurement of coating thickness—Eddy current (ISO 2360, IDT)
GB/T 6462 Metallic and oxide coatings—Measurement of coating thickness—Microscopical method (ISO 1463, IDT)
GB/T 8015.2 Test methods for thickness of anodic oxidation coatings on aluminium alloys—Split-beam microscope method
GB/T 11378 Metallic coatings—Measurement of coating thickness—Profilometric method (ISO 4518, IDT)
GB/T 12334 Metallic and other inorganic coatings—Definitions and conventions concerning the measurement of thickness (idt ISO 2064)
GB/T 13744 The measurement of coating thickness for electro-deposited nickel coatings on magnetic and non-magnetic substrates (idt ISO 2361)
GB/T 16921 Measurement of metallic coating thickness—X-ray spectrometric methods (eqv ISO 3497)
ISO 3543 Metallic and non-metallic coatings—Measurement of thicknesses—Bata backscatter method
ISO 3868 Metallic and other non-organic coatings—Measurement of coating thicknesses—Fizeau multiple-beam interferometry method
ISO 9220 Metallic coatings—Measurement of coating thickness—Scanning electron microscope method
ISO 10111 Metallic and other inorganic coatings—Measurement of mass per unit area—Review of gravimetric and chemical analysis methods
3 Terms and definitions
For the purpose of this standard, the terms and definitions specified in GB/T 12334 apply.
4 Non-destructive methods
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Non-destructive methods
5 Destructive methods
Bibliography
