Shanghai Daoqin Plastics Co., Ltd.

      electroplating parts easy 漂浮, and tool 接触 方 easy by 烧焦因 is plastics specific gravity small, therefore in solvent liquid in easy 浮起. lamp covers outer 形就象一 small 盘一样, inner surface 凹进,边 upper has small 孔,开始 use copper filament 卡 两 small 孔进行 electroplating. due to electroplating in gas 体 放出, lamp covers easy and copper filament 脱离, add copper filament light,不足以 make lamp covers solvent liquid 里. rear in copper filament upper upper heavy material, solution issues. copper filament and lamp covers 接触点 by 烧焦,并露出 plastics, is conductive defect 引起. is solution parts and conductive issues,我们 design 专门 夹 tool. tool has weight, upper lamp covers rear again 浮起, again use relatively wide conductive sheet/slice in lamp covers upper, make electrical uniform,接触点就不会烧焦.
       plastics front liquid and process formulation
formulation 1     plastics electroplating 预处理净化 solvent liquid hydrogen oxidation 钠 25S／L carbon acid 钠 30S／L acid 钠 50p／L powder amount water add 至11 描述 process conditions: temperature degree 50℃, time 以 净油污 is 准. is remove plastics products surface and 杂质, ensure surface 洁净, promote coarse uniform.
formulation 2    coarse solvent liquid (一) acid 1840g 铬酐 150~200g water 450g process conditions: temperature degree 40-50cC, time (for BS, PVC plastics)1-2ho
  formulation 3   coarse solvent liquid (二) water alcohol 394．65g ketone 394．90g process conditions temperature degree room temperature, time 10-20min. coarse function is make plastics surface micro coarse 糙, make plastics products water formed hydrophilic water, from improve/increase and plating combined force.
formulation 4     plastics electroplating coarse liquid oxidation 铬 70g water 150mL concentrated acid 350mL 描述 70g oxidation solvent 于150mL water in, again slow concentrated acid 350mL即 can. plastics electroplating front will products in 60?70~C coarse liquid in 处理1?20h(ABS plastics 1h, polystyrene (PS) 20h), rear 进行敏化处理.
　　 lamp covers chemical copper 时出现 bubbles, electroplating rear bubbles large,并 can plastics electroplating process process/workflow is: remove 油→ water 洗→ coarse 化→ water 洗→敏化→自 water 洗→ water 洗→ active 化→ water 洗→ chemical copper → water 洗→ electroplating → water 洗→ drying. above can 知, chemical copper front steps issues 都会导致鼓泡. 引起结 combined force good causes has very more,经常 easy issues is remove process and coarse process. remove 油不彻底,会引起掉皮, 脱落. lamp covers using/adopting is chemical remove 油(plastics parts 不适宜 use has machine solvent agent remove 油),操 as 时, temperature degree rise high to 65～70℃,不断 抖动工 parts,直 to water rear water is 止. coarse is ABS plastics electroplating in very important process. coarse 化不足,结 combined force decline; coarse degree, also make large deformation,结 combined force reduce.
　　 due to liquid in 二价锡极 unstable, therefore liquid easy 失效,如不 adjustment,会导致 active 化失败. active 化不足,会 make chemical plating 沉积不 full;而 active degree, make active property metal in surface also more formed 不连续 film 层,也会 make combined force decline. from remove 油开始,严格按 remove liquid formulation and as conditions, also coarse chemical industry time, temperature degree, new made liquid and active liquid,结果 chemical copper rear still bubbles. 几次反复 experiment/testing,结果一样, most rear 断定鼓泡不 is remove 油, coarse 化, 敏化, active 化引起. 此时怀疑 is material formed separation and molding process has issues,因 is ABS plastics formed separation and molding process and electroplating has 直接 关系.
　　ABS plastics raw materials easy water, requirements pressure front water content low 于0.1%,必 must in 80℃ hot drying in dry 2～4h,周围 ring 境也必 must drying. ABS plastics raw materials in can mixed its it formed separation. through 调查发现 injection molding will a large amount of molding ABS plastics parts in wet 库房 面 upper, but also injection molding front raw materials 未经烘 dry. in 我们 指导 lower, will need injection molding raw materials in 80℃ lower dry 2～4h,经检验符 combined electroplating requirements rear again injection molding. rear lamp covers electroplating rear issues again has 出现.
　　 lamp covers electroplating rear surface 出现黑斑,无 gloss lamp covers chemical copper rear,转入 electroplating 工序,我们 using/adopting process process/workflow is:镀镍→镀 copper →镀亮镍→镀铬. copper solvent liquid comparison stability, main/primary issues is copper cationic in electroplating in easy generate copper powder (Cu2O), copper powder 进入镀 liquid 会引起 plating coarse 糙. use resistant property cationic 极布包住 cationic again cationic sleeve/set in, electroplating rear 经常打开清洗, therefore,镀 copper rear surface light 亮, fine 致, 没出现任何 issues. parts 镀亮镍 rear surface gloss, but also has 黑斑, add light agent rear, issues still remove, analysis liquid,各 formed separation content in scope/range inner.
　　槽 liquid 放置一夜 rear, upper liquid full to use 槽,发现镀槽底部 has color 泥状沉淀 material. analysis is due to solvent liquid temperature degree high, light agent separation understanding 致, electroplating 时,空 gas plant/unit 槽底 泥渣翻起,同镍离子一起沉积 to plating upper,造 formed and 黑斑. rear also 发现, due to 镀镍, 镀铬同 use sleeve/set conductive rod, conductive rod upper belt/tape has 镀铬时留 lower 铬酐,镀镍时, easy will belt/tape 入镍槽 in; also due to tool has insulation,镀镍 solvent liquid in belt/tape copper 杂质, this is 引起发黑 causes. copper can use 0.5A/dm2 electrical density electrical understanding remove. remove 六价铬,先 use acid adjustment liquid pH至3 left right,然 rear add 入亚硫 acid 钠0.2～0.4g/L,搅拌, make 六价铬 also is 三价铬,然 rear use low electrical density remove 三价铬.
　　 most rear use active property 炭处理 滤 remove has machine 杂质. liquid 经处理 rear,镀镍 rear again has 出现黑斑. sleeve/set 铬时, lamp covers using/adopting cationic 极, most rear lamp covers light 亮, fine 致,符 combined product requirements.
　　 plastics parts formed separation and molding process can overlook, this is electroplating as easy issues.
　　 electroplating need design specialized tool.
　　 attention/notes liquid 维护, make formed separation maintain in process specification inner.
　　 add strong/high 工序间 清洗,不 need its it belt/tape 入.

ABS/3001MG2A/ Japan UMG product property