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Last Updated: Jan 10, 2018
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ASTM F326-96(2012)
Standard Test Method for Electronic Measurement for Hydrogen Embrittlement From Cadmium-Electroplating Processes
Standard Test Method for Electronic Measurement for Hydrogen Embrittlement From Cadmium-Electroplating Processes
F0326-96R12
ASTM|F0326-96R12|en-US
Standard Test Method for Electronic Measurement for Hydrogen Embrittlement From Cadmium-Electroplating Processes
Standard
F326 Standard Test Method for Electronic Measurement for Hydrogen Embrittlement From Cadmium-Electroplating Processes>
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Significance and Use
5.1 Hydrogen is evolved during metal electrodeposition in aqueous baths. Some of this hydrogen enters parts during plating. If the absorbed hydrogen is at a level presenting embrittlement hazards to high-strength steel, it is removed by baking parts after plating to expel this hydrogen. However, the lack of plate porosity itself may block hydrogen egress. Thus, it becomes important to know both the relative amount of hydrogen absorbed and the plate porosity.
5.2 This test provides a quantitative control number for cadmium plate porosity that can be used to control a cadmium plating process and the status of cadmium-plated hardware. It can also be used for plating process troubleshooting and research and development to determine the effects on plate porosity by process variables, contaminants, and materials. When used to control a critical process, control numbers for plate porosity must be determined by correlation with stress rupture specimens or other acceptable standards.
Scope
1.1 This test method covers an electronic hydrogen detection instrument procedure for measurement of plating permeability to hydrogen. This method measures a variable related to hydrogen absorbed by steel during plating and to the hydrogen permeability of the plate during post plate baking. A specific application of this method is controlling cadmium-plating processes in which the plate porosity relative to hydrogen is critical, such as cadmium on high-strength steel.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statement, see Section 8.