T/CSEA 8-2019 Silver plating general specification without cyanide

Scope

Scope: This standard specifies the terms and definitions, requirements, and testing methods for cyanide-free silver plating layers. This standard applies to mechanical, marine, aerospace, electronic, and electrical applications on metal and non-metal substrates. Main technical content: 4. Process requirements 4.1 Materials 4.1.1 Substrate materials: The quality control of metal parts before electroplating should comply with the requirements of GB/T 12611. 4.1.2 Process materials: The silver anode material for cyanide-free silver plating should be electrolytic silver with a purity of ≥99.9%. Other process materials and auxiliary materials should comply with the requirements of GJB 480B section 5.3, and the process water should meet the requirements of HB 5472. 4.2 Process flow: Pre-acceptance, hanging, pretreatment, cyanide-free silver plating, post-processing, inspection and testing, packaging. 4.2.1 Process description 4.2.1.1 Pre-acceptance: Conduct acceptance according to GB/T 12611 requirements. 4.2.1.2 Hanging: Use general or specialized tooling designed according to the shape, size, quantity, and technical requirements of the parts drawings for hanging. 4.2.1.3 Pretreatment: Conduct pretreatment according to GB/T 12611 requirements. For stainless steel and high-temperature alloys that require impact nickel plating, refer to Table 1. For metal parts before electroplating, stress relief heat treatment is required according to Table 1. For parts subject to mechanical processing, grinding, cold forming, cold drawing, or cold straightening, if the maximum tensile strength of the material is ≥1050 MPa and the parts require stress relief treatment as specified in the technical documents, the stress relief heat treatment should be carried out according to the relevant specifications. The stress relief should be performed before shot peening, sandblasting, cleaning, and electroplating. The temperature for pre-stress relief is generally 20–30°C lower than the annealing

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