Potassium Sulfide Blue-Black Recipe
硫化钾电解液蓝黑着色配方
标签：硫化钾, 蓝黑, 阳极, 低温
配方：硫化钾 K₂S 10–20 g/L，纯水配制，工件接阳极、不锈钢对阴极，电压 1.5–3 V，室温，时间 30–90 秒。产物为硫化铜黑膜，呈蓝黑光泽。完成后立即温水洗、稀碱中和、软布抛光。必须在通风橱操作，硫化物释放 H₂S 恶臭且有毒，严禁密闭空间。
Recipe: potassium sulfide K₂S 10–20 g/L in pure water, workpiece as anode vs stainless cathode, 1.5–3 V, room temperature, 30–90 s. Product is a cupric-sulfide black film with blue-black sheen. Rinse in warm water, neutralize with dilute alkali, buff. Operate in a fume hood—sulfides release toxic, foul H₂S; never in an enclosed space. ---