Selenide & Chlorate-based Alternative Recipes
硒化物与氯酸盐环保替代配方
标签：硒化物, 氯酸盐, 替代, 硫化物, 环保, 深色
需要比硫化物更深的哑光黑时，可用亚硒酸体系替代：亚硒酸 10 g/L + 硫酸铜 5 g/L + 硝酸调 pH 2–3，室温浸 1–3 min 得致密铜硒化物黑膜，附着力优于高温硫化黑。户外模拟自然铜绿的环保配方则用碱性氯化铜铵（15 g/L + 碳酸钠缓冲 pH 8–9）喷涂，每日 2 次、连喷 7 天形成绿锈，避免了盐酸体系的强腐蚀与氯残留。
For a deeper matte black than sulfides, use selenous acid: 10 g/L selenous acid + 5 g/L copper sulfate, pH 2–3 with nitric acid, 1–3 min at room temperature for a dense copper-selenide black with better adhesion than hot-sulfide black. For eco-friendly architectural verdigris, spray alkaline ammonium copper chloride (15 g/L, sodium-carbonate buffered to pH 8–9) twice daily for 7 days — no hydrochloric-acid corrosion or chloride residue. ---