三价铬钝化件六价铬检出阳性问题及其评价  

Evaluation on positive results in the determination of hexavalent chromium in trivalent chromium passivation coatings

作　　者：李金花[1] 姚晨岚[1] 刘国琴[1] 周保学[1] 

机构地区：[1]上海交通大学环境科学与工程学院,上海200240

出　　处：《电镀与涂饰》2009年第4期29-31,共3页Electroplating & Finishing

摘　　要：简述了三价铬钝化层中检出六价铬的原因。评述了几种RoHS认证通常采用的六价铬检测标准,包括点滴法和水煮法。讨论了RoHS认证中三价铬钝化层中六价铬检测的有关问题。提出了一些避免三价铬钝化层中检出六价铬的建议,如:采用沸水提取法而不是碱液提取法,以降低六价铬检出几率;控制检测条件;调整钝化液配方和钝化工艺条件。The reasons for the occurrence of hexavalent chromium in trivalent chromium passivation coatings were described. Several hexavalent chromium determination standards commonly used for the compliance of RollS directive were evaluated, including spot test procedure and boiling-water extraction procedure. Some problems arisen during the determination of hexavalent chromium in trivalent chromium passivation coatings for the compliance of RollS directive were discussed. Some suggestions for preventing the positive result of hexavalent chromium determination in trivalent chromium coatings were presented, such as using boiling-water extraction instead of alkaline digestion to reduce the probability of a positive result, controlling the determination conditions, and modifying bath composition and process conditions oftrivalent chromium passivation.

关 键 词：三价铬钝化膜 六价铬 检测 阳性 ROHS指令 

分 类 号：TG178[金属学及工艺—金属表面处理] TQ153.15[金属学及工艺—金属学]