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GB/T 31554-2015: Non-magnetic metallic coatings on metallic and non-metallic basis materials -- Measurement of coating thickness -- Phase-sensitive eddy-current method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 31554-2015: Non-magnetic metallic coatings on metallic and non-metallic basis materials -- Measurement of coating thickness -- Phase-sensitive eddy-current method---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31554-2015 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.220.40 A 29 GB/T 31554-2015 / ISO 21968.2005 Non-magnetic metallic coatings on metallic and non- metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method (ISO 21968.2005, IDT) Issued on: MAY 15, 2015 Implemented on: JANUARY 1, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Principle ... 4 3 Equipment ... 5 4 Sampling ... 5 5 Factors affecting measurement accuracy ... 5 6 Procedure ... 8 7 Expression of results ... 11 8 Measurement uncertainty ... 11 9 Test report ... 11 Annex A (informative) Eddy-current generation in a metallic conductor ... 13 Annex B (normative) Test for edge effect ... 16 Bibliography ... 18ForewordThis Standard is drafted according to the rules given in GB/T 1.1-2009. This Standard uses the translation method to equivalently adopt ISO 21968.2005 “Non-magnetic metallic coatings on metallic and non-metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method” (English version). For easy use, this Standard has the following editorial modifications. - DELETE the foreword of the International Standard; - ADD the foreword of China’s national standard; - The international standards in the standard text and the bibliography are replaced by identical China’s national standards. This Standard is proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Metallic and Nonmetallic Coatings of Standardization Administration of China (SAC/TC 57). Drafting organizations of this Standard. Guangdong Entry-Exit Inspection and Quarantine Bureau, Chongqing Institute of Measurement and Quality Testing, Wuhan Material Protection Institute, Wuhan Kangjie Technology Co., Ltd., Standardization Research and Development Center of Nanhai District, Dongguan Yian Technology Co., Ltd. Main drafters of this Standard. Zhang Zhenkun, Zhou Qi, Jia Jianxin, Li Xiaomin, Si Nianpeng, Yu Peng, Gao Zhengyuan, Yu Hui, Hong Fangze and Li Weirong. Non-magnetic metallic coatings on metallic and non- metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method1 ScopeThis Standard describes a method of using phase-sensitive eddy-current instruments for nondestructive measurements of the thickness of non-magnetic metallic coatings on metallic and non-metallic basis materials, such as. a) zinc, cadmium, copper, tin or chromium on steel; b) copper or silver on composite materials. The phase-sensitive method can be applied without thickness error to smaller surface areas and to stronger surface curvatures than the amplitude-sensitive eddy-current method described in GB/T 4957, and is less affected by the magnetic properties of the basis material. However, the phase-sensitive method is more affected by the electrical properties of the coating materials. When measuring metallic coatings on metallic basis materials, the product of conductivity and permeability (σ, μ) of one of the materials should be at least a factor of 1.5 times the product of conductivity and permeability for the other material. Non- ferromagnetic materials have a relative permeability of 1.2 PrincipleAn eddy-current probe (or integrated probe/instrument) is placed on (or near) the surface of the coating(s) to be measured, and the thickness is read from the instrument's readout. For each instrument, there is a maximum measurable thickness of the coating. Since this thickness range depends on both the applied frequency of the probe system and the electrical properties of the coating, the maximum thickness should be determined experimentally, unless otherwise specified by the manufacturer. An explanation of eddy-current generation and the calculation of the maximum measurable coating thickness, dmax is given in Annex A. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 31554-2015 be delivered?Answer: The full copy PDF of English version of GB/T 31554-2015 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 31554-2015_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 31554-2015_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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