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
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. 5.3 There is no prime standard for plate porosity. For this reason, two ovens must be used, with tests alternated between ovens. Data from the ovens are compared to ensure no equipment change has occurred. 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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statement, see Section 8. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM F326-23: Standard Test Method for Electronic Measurement for Hydrogen Embrittlement From Cadmium-Electroplating Processes provides an established electronic test method for detecting hydrogen embrittlement risk in steel components subjected to cadmium electroplating. Hydrogen embrittlement, often a critical concern for high-strength steels, can lead to premature failure if not properly controlled during plating processes. This standard describes an instrument-based procedure for measuring hydrogen permeability and absorbed hydrogen in cadmium-plated parts, offering quantitative data to assess process quality and plating integrity.
The method is particularly suited for process control, quality assurance, and troubleshooting of cadmium electroplating operations where the hydrogen retention characteristics of the plated layer are critical. The test also plays a vital role in correlating plating porosity and hydrogen egress with embrittlement hazards, complementing mechanical test methods.
Hydrogen Absorption in Plating: The standard addresses hydrogen evolution and absorption during metal electrodeposition in aqueous cadmium plating baths. Absorbed hydrogen presents embrittlement risks, especially in high-strength steels.
Electronic Detection Method: Utilizes a hydrogen detection instrument and specially designed probe for quantitative measurement of hydrogen permeability through cadmium plating after process baking. The test quantifies hydrogen content and plating porosity.
Porosity Control: By determining a plate porosity control number, the method helps manage cadmium plating processes to minimize hydrogen entrapment and ensure optimum plating performance.
Process Troubleshooting: The test can identify process variables, contaminants, and material choices influencing the risk of hydrogen embrittlement, supporting research and development as well as continuous process improvement.
Calibration and Equipment Correlation: To ensure reliability, the method requires calibration of the hydrogen detection apparatus and cross-verification using duplicate ovens to maintain consistency in results.
ASTM F326-23 is widely implemented across industries where the durability and safety of cadmium-plated, high-strength steel components are paramount. Key areas of application include:
Другие стандарты ASTM
Aerospace and Defense: Used to assess and control hydrogen embrittlement risk in fasteners, landing gear, and other safety-critical hardware.
Automotive Industry: Applied to plated components exposed to high loads or stress where hydrogen-induced delayed failure is a concern.
Manufacturing and Maintenance: Adopted for process control in plating facilities, ensuring the quality and compliance of cadmium-plated products.
Research & Development: Utilized for evaluating new plating processes, alternative materials, and process variables impacting hydrogen egress and plate porosity.
Employers and quality managers rely on this standard to document process capability, investigate failures, or verify that plating baths and operating procedures do not promote excessive hydrogen entrapment.
cadmium electroplating, hydrogen embrittlement, hydrogen detection, plating porosity, ASTM F326-23, quality control, process control, steel, high-strength steel, aerospace, automotive, plating process verification