GB 12307.1-1990 Test methods for metallic coatings - Silver and silver alloy electroplated coatings - Part 1: Determination of coating thickness GB12307.1-1990 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Metallic coatings
Test methods for electrodeposited silver and silver alloy coatings
Part 1
Determination of coating thickness
Metalllc coatings --
Test methods for electrodepositedsilver Bnd silyer alloy coatlngs -Part I: Determlnation of coating thicknessGB 12$07. 1 --90
This standard is equivalent to the national standard 1S04522/1-1985 "Test methods for electrodeposited silver and silver alloy coatings Part 1: Determination of coating thickness".
Subject content and scope of applicationwww.bzxz.net
This standard specifies the method for determining the conductivity of silver and silver alloy coatings. This standard is applicable to the determination of the thickness of silver-silver alloy electroplated layers for engineering, decoration and protection. Note: If the basic error can be guaranteed to be less than 1%, other methods with the same or more accurate results as those specified in this standard can be used in other applications.
2 Reference standards
GB6462
GB4955
GB4956
Metal and oxide coating cross-sectional thickness Microscope measurement Force method Metal coating thickness measurement method Anodic dissolution Coulometric measurement method Metal coating strength measurement method Magnetic method
GB 4677.8 Printed board coating thickness measurement method β backscattering method GB11378
Metal coating thickness measurement method 3 Coating thickness determination method
Microscope method
The thickness of silver and silver alloy electroplated layers shall be determined according to the method specified in GB6462. This method is defined as arbitration method. 3.2 Coulometric method
The thickness of silver and silver alloy electroplating layer shall be determined according to the method specified in GB4955. 3.3 β backscattering method
The thickness of silver and silver alloy electroplating layer shall be determined according to the method specified in GB4677.8. 8.4 Magnetic method
The thickness of silver and silver alloy electroplating layer shall be determined according to the method specified in GB4956. 3.5 Wheel size method
The thickness of silver and silver alloy electroplating layer shall be determined according to the method specified in GB11378. 3.6 Weighing method
3.6.1 Original burial
Approved by the State Administration of Technical Supervision on April 6, 1990 and implemented on January 1, 1991
GB 12307.1-90
Chemically or electrochemically dissolve the silver or silver alloy electroplating layer (without corroding the substrate) and measure the quality of the electroplating layer. The average thickness of the electroplated layer is calculated from the mass, area and density of the electroplated layer. 3.6.2 Stripping solution
A solution that can remove the silver or silver alloy stripping layer by chemical or electrochemical methods without corroding the substrate. Note: ① The stripping layer on nickel and steel substrates can be stripped by electrolysis at room temperature in a solution containing 90% sodium hydroxide and 15% sodium hydroxide with the steel plate as the cathode and the voltage at 2-6V.
The silver stripping layer on copper and copper alloy substrates can be dissolved in a solution containing 19% concentrated sulphuric acid (with a concentration of 1.84 g/m1) and 1:1 volume of condensed acid (with a concentration of 1.42 μm1) at 65°C. The solution must be fully dehydrated and the water content should be low. ③ The silver stripping layer on the nickel alloy substrate can be stripped by electrolysis at room temperature in a solution containing 30 g/l sodium hydroxide with the steel plate as the cathode and the voltage at 4°C. 3.6.3 Operation steps Degrease, rinse, dry and weigh the sample. Use a stripping solution (9.2) suitable for the base metal. After the silver or silver alloy electroplating layer is stripped, rinse it thoroughly in running water, dry it and weigh it again. 3.6.4 Thickness calculation The average thickness (um) of the electroplating layer is calculated according to formula (1), 10m The difference in mass before and after stripping of a sample, m: A—surface area of ​​the electroplating layer, cm2; p—density of the electroplating layer, g/cm3. Note: Except for the known true density value, p is 10.6g/cml. 1 Chemical analysis method 1.1 Operation steps Dissolve the silver or silver alloy electroplating layer on the sample of known area in an appropriate solution (9.2) and measure the silver content in the solution using an appropriate analytical method.
4.2 Calculation of analysis results
The average thickness d (μm) of the electroplated layer is calculated according to (2): d = -
Wherein: A—the mass of silver, mg
A—the surface area of ​​the electroplated layer, cm2,
——the density of the electroplated layer, g/cm\;
Mag——the silver content of the electroplated layer, expressed as mass percentage. 5 Micrometer direct measurement
The thickness of the electroplated layer is less than 50um, and can be directly measured with a micrometer before and after electroplating. Standard: If the nest is measured for insect effect, the upper two annealings are between the scale cards. The accuracy of this method is low. 6 Test report
The test report should include the following contents:
GB 12$07.1—90
References to the relevant parts of this standard, including the number of the specified method adopted; Test results and expression form
Any abnormal phenomenon observed during the test steps, and the references do not include any test operations in this standard or the Runjia standard. Any other content required by the purchaser.
Additional remarks:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Standardization Technical Committee for Metallic and Non-metallic Coverings. This standard was drafted by the Electronic Standardization Research Institute of the Ministry of Machinery and Power Plant Industry and Beijing Broadcasting Equipment Factory. The main drafters of this standard are Zhao Changchun, Zhou Zhichun, Yu Xiaogu, and Jiang Sihong.
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