The testing items for gold stripping agents mainly include chemical composition analysis, physical performance testing, corrosion assessment, stripping efficiency testing, and environmental safety indicators. Chemical composition testing includes cyanide concentration in the range of 0.01-5.0 wt%, pH value between 1.5 and 4.0, chloride ion content ≤200 ppm, and organic solvent ratio, such as ethanol ≥90%. Physical performance testing involves a density range of 0.8-1.2 g/cm³, dynamic viscosity at 25℃ of 10-50 cP, boiling point ≥100℃, and flash point ≥60℃.
Corrosion testing requires copper substrate corrosion ≤0.05 mm/year, with a corrosion rating. In the stripping efficiency test, the coating stripping speed ≥5.0 μm/min, and the gold layer removal percentage ≥99.0%. Environmental safety indicators include lead content ≤0.1 ppm, cadmium content ≤0.05 ppm, biodegradability ≥80%, total volatile organic compounds ≤50 μg/g, and sulfate concentration ≤100 ppm.
The testing scope of gold stripping agents covers electronic gold plating layers, jewelry silver plating layers, industrial copper alloy substrates, nickel-based alloy surfaces, stainless steel product coatings, aluminum alloy metallization layers, plastic substrate metal layers, ceramic metal coatings, composite metal materials, and recycled metal waste.
