T/CSEA 9-2019 The technical conditions for non-cyan plating cadmium with potassium chloride

Scope

Scope: This standard specifies the terms and definitions, process, quality requirements, and inspection methods for potassium chloride cyanide-free cadmium plating solutions and coatings. This standard applies to the quality inspection of potassium chloride cyanide-free cadmium plating solutions and coatings on aerospace product parts (components); Main technical content: 6. Plating layer quality requirements 6.1 Appearance 6.1.1 Color 6.1.1.1 The cadmium plating layer should be light beige; 6.1.1.2 After being treated with 1%–2% nitric acid solution, the cadmium plating layer should be silver-white; 6.1.1.3 After being passivated with low-concentration chromate solutions, the cadmium plating layer should be iridescent; 6.1.1.4 The phosphated cadmium plating layer should have a fine crystalline structure and be light gray. 6.1.2 Uniformity The cadmium plating layer should be fine-grained, uniform, and continuous. 6.1.3 Permitted defects 6.1.3.1 Slight watermarks; 6.1.3.2 Uneven color on the same part due to differences in material and surface condition; 6.1.3.3 Slight roughness at the edges and corners of complex or large parts, but not affecting assembly; 6.1.3.4 Unless otherwise specified, the local cadmium-plated parts may have a plating-free border of 1 mm on either side; 6.1.3.5 Darkening and blackening of the plating layer at the welding seams of welded parts, and foaming of the plating layer at tin-lead welding seams; 6.1.3.6 The inner surfaces of holes, grooves, and slots with a depth greater than 1 times the diameter (or width) are allowed to be plating-free. 6.1.4 Non-permitted defects 6.1.4.1 Bubbling, peeling, burning, black spots, pitting, and roughness of the cadmium plating layer; 6.1.4.2 Dendritic, spongy, and striated plating layers; 6.1.4.3 Local plating-free areas; 6.1.4.4 Removable loose passivation films; 6.1.4.5 Unwashed salt stains. 6.2 Plating layer thickness 6.2.1 The thickness of the cadmium p

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