1 Scope
This standard describes a method for the measurement of the local thickness of metallic coatings, oxide layers, and porcelain or vitreous enamel coatings, by the microscopical examination of cross-sections using an optical microscope.
Warning: The use of this document may involve the use of hazardous materials, operations and equipment. This document does not address any health hazard and safety issues associated with its use. It is the responsibility of the user to establish appropriate health and safety practices and to take suitable action to comply with any national and/or local regulations prior to its use.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 12334 Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness (idt ISO 2064)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12334, as well as the following apply.
local thickness
the mean of the thickness measurements, of which a specified number is made within a reference area
4 Principle
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Factors relating to measurement uncertainty
6 Preparation of cross-sections
7 Measurement
8 Measurement uncertainty
9 Test report
Annex A (Informative) Guidance on the preparation and measurement of cross-sections
Annex B (Informative) Taper of cross-section and measurement of tooth-constructed coatings
Annex C (Informative) Some typical etchants for use at room temperature
Bibliography
