Green Citrate Electro-etching for Texture Masters
柠檬酸盐电解蚀刻的绿色母板工艺
标签：柠檬酸电解, 环保蚀刻, 无危废, 母板
以 10% 柠檬酸溶液加 3% 食盐作电解液（pH 约 2.5），铜母板接正极、不锈钢接负极，6 V、0.3–0.5 A/dm² 电解 10–20 min，可得均匀消光细纹理，全程不产生三氯化铁类危废；蚀下的铜以柠檬酸铜溶于液，废液加碱调 pH 后铜沉淀回收。欧美首饰圈广泛用此配方替代 FeCl3 制作首饰级母板。缺点是蚀速约为 FeCl3 的三分之一，深纹理需分次电解并刷除阳极泥。
Use 10% citric acid with 3% salt as electrolyte (pH about 2.5): copper master positive, stainless cathode, 6 V at 0.3–0.5 A/dm² for 10–20 min yields a uniform satin micro-texture with no ferric-chloride hazardous waste—copper dissolves as citrate and can be precipitated out by raising pH. Widely adopted in the jewellery community to replace FeCl3. Slower—about one third the etch rate—so deep textures need staged passes and anode-sludge brushing.