Adhesion & Thermal-shock Testing of Enamel
珐琅层附着力与热震测试标准
标签:热震试验, 附着力, 盐雾试验, 铅镉溶出, 质量验收
铜胎珐琅验收常用三法:①热震试验(参照 GB/T 7991、ISO 2747):样品 200℃ 保温 15 min 后立即投入 20℃ 水中,3 次循环釉面无裂纹剥落;②冲击法:直径 12.7 mm 钢球自 1 m 落体,检查釉面结合与崩边;③中性盐雾 96 h 查边缘气泡。日用器皿另按食品接触标准(GB 4806 / 欧盟 84/500/EC)测铅镉溶出。测试须在烧成后 24 h 内进行,否则应力松弛影响结果真实性;批量按抽检表 AQL 2.5 执行。
Three acceptance tests for copper-base enamel: thermal shock (per GB/T 7991 / ISO 2747)—15 min at 200℃ then immediate 20℃ water quench, three cycles with no cracking or spall; impact—a 12.7 mm steel ball dropped from 1 m, checked for chipping and bond failure; and 96 h neutral salt spray for edge blistering. Tableware adds food-contact lead/cadmium release testing (GB 4806 / EC 84/500/EC). Test within 24 h of firing or stress relaxation skews results; batches sample at AQL 2.5.