GB/T 31554-2015
Non-magnetic metallic coatings on metallic and non-metallic basismaterials.Measurement of coating thickness.Phase-sensitive eddy-current method (English Version)
- Standard No.
- GB/T 31554-2015
- Language
- Chinese, Available in English version
- Release Date
- 2015
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 31554-2015
- Scope
- This standard specifies the method for non-destructive measurement of the thickness of non-magnetic metal coatings on metal and non-metal substrates using phase-sensitive eddy current thickness gauges, such as: a) zinc, cadmium, copper, tin or chromium plating on steel substrates; b) composite materials Copper or silver plated on the substrate. Compared with the GB/T 4957 amplitude-sensitive eddy current method, the phase-sensitive eddy current method has no thickness measurement error for coatings on smaller surfaces and larger curvature surfaces. Electrical properties are more affected. To measure the metal coating on the metal substrate, the conductivity and permeability (σ, μ) of one material (such as the substrate material) of the product should be at least 1.5 times the conductivity and permeability of the other material (such as the coating material) . The relative permeability of non-ferromagnetic materials is 1.
GB/T 31554-2015 history
- 2015 GB/T 31554-2015 Non-magnetic metallic coatings on metallic and non-metallic basismaterials.Measurement of coating thickness.Phase-sensitive eddy-current method
