Shanghai Daoqin Plastics Co., Ltd.

         plastics electroplating Common fault/failure analysis and 处理:

        1. parts surface 都镀不 upper copper 层;出现 this category of fault/failure causes, generally is liquid or active liquid 失效引起, also has can can is chemical copper liquid in pH value, temperature degree, aldehyde, acid copper content low or combined agent content high 而引起. for this category of fault/failure 处理, 应先检查敏化 liquid, active liquid or 胶体钯 solvent liquid is positive 常. use new made a small amount of and active liquid (or 胶体钯 solvent liquid), if coarse plastics parts new made and active liquid rear can 够沉积 upper copper 层, 证明原 敏化 liquid or active liquid already 失效, adjustment or more this solvent liquid. coarse shallow color plastics parts, 经 原 敏化 and active solvent liquid rear, parts surface can is color, 说明敏化 liquid and active liquid 未失效, 应检查 chemical copper liquid. in chemical copper liquid 时, 先检查 solvent liquid pH value and temperature degree, will solvent liquid pH value 调至12 left right, temperature degree control in 30℃ left right, again 补充适 amount aldehyde rear 进行试镀, parts upper still can upper copper 层, from chemical copper liquid color (color shallow) or formed separation analysis, 判断镀 liquid in acid copper content is low, if content low, 应补充适 amount acid copper salt. this analysis and 处理, can remove parts upper copper phenomenon.

        2. chemical copper 时. parts surface local upper copper parts local upper and full upper is different, this type of fault/failure causes is: parts surface local upper can can is remove 油不彻底; coarse defect;敏化 or active time 不够; plastics parts has force or chemical copper liquid formed separation and other. parts remove 油不彻底造 formed upper 仅发生 in less parts and parts local upper, has parts surface has 油, therefore, this type of fault/failure phenomenon is less 数, can 采取良 good remove measures remove;若 plastics has force 引起 镀不 upper usually in parts versus 似 部位, can will a small amount of parts hot 处理 应 force rear, again commonly used coarse 化, 敏化, active and chemical copper 进行检查 troubleshooting this type of fault/failure; chemical copper liquid formed separation usually performance is copper speed degree slow. if in chemical copper 时, plastics parts surface in 5min之 inner 开始沉 copper, that is copper liquid formed separation issues;若 chemical copper 时, plastics parts parts surface in 15min above also has copper 层, that can can is chemical copper liquid pH value low, temperature degree low, aldehyde content low, acid copper content low or combined agent content high causes, can analysis solvent liquid ratio/proportion adjustment remove this type of fault/failure. another, coarse solvent liquid in acid content 不足, coarse temperature degree low or time short 也会出现 coarse defect, parts local surface upper copper.

         different plastics need using/adopting different coarse temperature degree and time, large more Domestic ABS plastics, coarse temperature degree in 60℃～65℃, time is 20min～30min就 can, coarse temperature degree again high, easy formed coarse degree, make plastics parts deformation. Japan electroplating grade ABS plastics, use 60℃～65℃ temperature degree has low, easy formed parts coarse defect, generally 以70℃～75℃ coarse is good. also need parts is deformation, easy deformation parts, coarse temperature degree low 一, time long 一. for/regarding 一 不 easy deformation parts, coarse temperature degree can high 一, time short is good. has in coarse temperature degree control in 82℃～85℃, time shrink short is 2min～5min, this coarse parts, chemical copper rear in electroplating light copper 时就亮 fast, light degree good. therefore, in coarse 化时, according to different plastics material, good coarse solvent liquid temperature degree and time, anti 止出现 coarse defect formed electroplating fault/failure. certain in plastics electroplating process in, sleeve/set plastics parts is positive injection molding parts, is in injection molding sheet/plate upper machine processing formed 形, surface light parts, using/adopting injection molding parts electroplating process electroplating. 结果发现该 parts in coarse front outer table/sheet very positive 常, 但一经 chemical coarse chemical industry 序, parts surface 就出现几处发黄 斑区, chemical copper 时该区 plating 就发黑, electroplating rear 出现漏镀 fault/failure. tube/pipe more adjustment chemical coarse process, long remove internal stress hot time, add strong/high chemical also 原工序, 但收效甚 micro. for plastics parts made as process 进行调查, understanding to made as ABS injection molding sheet/plate, injection molding machine material 膛清理不尽, injection molding sheet/plate upper has a small amount of black material material. machine processing and light, parts surface to defect, in coarse process in due to internal stress relatively large, very easy coarse degree, formed micro fine cracks or hydrophobic 松. this in active chemical industry in remove reaction also has separation reaction solvent liquid in cracks in, water 洗, aldehyde also 原也不 can full remove. make chemical copper can positive reaction process 进行, and in 该区形 formed black conductive Cu20层, formed local phenomenon 发生. rear 经该厂改 use chemical process plastics parts metal 化, 就避免 upper fault/failure 出现. this is chemical liquid in also agent (次亚磷 acid 钠) also can force large chemical copper solvent liquid in aldehyde, from remove this type of fault/failure.

         also has, and active time 不够, 往往也会出现 plastics parts local upper copper phenomenon, has one-time and active plastics parts, in local has formed active 化 银原子, this 样就会出现 local upper copper phenomenon. is remove this category of fault/failure, can in one-time and active rear, water rear again heavy 复进行第二次敏化 and active 化处理, 甚至进行第三次, 第四次敏化 and active 化处理, make coarse plastics parts, surface 各 部位都 has catalytic function 银原子, from remove parts local upper copper phenomenon.

        3. plating and plastics combined force plastics parts plating combined force is Common fault/failure phenomenon, generally this type of fault/failure causes is: plastics parts surface remove 油不彻底; plastics injection molding conditions 不当; surface coarse 化不够充 separation or coarse degree; chemical copper liquid in has and other 都会引起 plating 起泡, and other fault/failure. generally parts remove 油不彻底 is less phenomenon, can use add strong/high front remove measures this type of fault/failure 情况; injection molding conditions 不当造 formed plating combined force good 往往出现 in parts same 部位, but also has very more parts has this type of fault/failure phenomenon, is this type of causes can a small amount of parts, in in remove force rear, again coarse 化, 敏化, active and chemical copper, and electroplating rear plating combined force is good. parts coarse 化不够充 separation generate plating combined force good 往往出现 in parts upper, will plating 剥离, this plastics surface usually relatively light slip, coarse degree formed plating combined force good relatively more in parts and 边缘, plating rear this 部位呈现出 coarse appearance.

        检验 coarse is 否恰当 办 method is will coarse parts in cationic light lower or in in drying, drying rear surface 发白, parts and 边缘出现 fine powder material 质, this type of powder material use can 揩, table/sheet this parts already coarse degree, reduce coarse temperature degree or shrink short coarse time. drying rear parts surface, has less 数部位发白, large separation surface still is plastics natural color, table/sheet coarse 化不够充 separation, improve/increase coarse temperature degree or long coarse time.

        究竟 selection what coarse temperature degree and time? most good a small amount of parts, separation in different coarse temperature degree and time lower experiment/testing, make coarse parts can hydrophilic water, also can in drying rear surface uniform 发白而无 powder material in coarse temperature degree and time, rear control in this temperature degree and time lower coarse is good. using/adopting gas for improvement chemical copper crystallization 组织, decrease/reduce copper powder, long copper liquid use lifespan has benefits, chemical copper 依靠搅拌 improvement plating crystallization and long liquid lifespan mechanism is can fast speed remove liquid in reaction generate hydrogen gas, to liquid in types also agent function, is it in 会导致 local liquid active property strong/high; another need 严格净化搅拌通人 空 gas, 否则, 若 空 gas pressure shrink machine in belt/tape copper liquid in, will make copper coarse 糙, hydrophobic 松, combined force good. is chemical copper liquid alkali property, 若进入镀 copper liquid is 皂化油, 则就会发生皂化 reaction formed and 甘油, 若进入 solvent liquid is non 皂化油, that in long time gas lower separation emulsification, from make copper liquid in foam. therefore, 当观察 to copper liquid in has foam generate, meanwhile also copper coarse 糙, hydrophobic 松, combined force good 时, 就应检查通人镀 copper liquid gas is has 油, if has 油, need add strong/high gas 净化, another also need for copper liquid active property 炭处理, remove 油污, remove plating combined force good fault/failure.

        检查 plastics parts plating combined force can using/adopting method, use 锋利刃口间距lmm纵横互划l0 strip/profile, 划痕必 must plastics 基体, again use 规定 胶 viscous belt/tape pressure viscous, in 拉开胶 viscous belt/tape plating less has 90%不脱落 or full has plating viscous is combined 格. another can using/adopting hot ring experiment/testing plastics parts plating combined force, generally requirements will plastics parts 置于-30℃ lower lh, rear in room temperature lower 放置1h, in 70℃ lower lh, most rear to room temperature lh is 一 循 ring, tool has high combined property can requirements is 经 4 循 ring plating can has is combined 格.

        4.镀 copper upper has deep color powder 末出现 this type of fault/failure causes is: chemical copper parts more; coarse degree;镀 copper liquid pH value or temperature degree high; copper salt content high combined agent content less; also agent content more or copper liquid by active liquid and other. analysis and this category of fault/failure 时, need 先检查 parts chemical 镀 装载 amount is more, if amount more, need decrease/reduce chemical copper parts amount, this type of fault/failure can remove; again shrink short chemical coarse time plastics parts coarse is degree, is upper causes, need chemical copper solvent liquid.

         generally 讲, copper solvent liquid by active liquid and chemical copper liquid formed separation and as conditions is different, rear usually make copper speed degree add fast, speed degree fast 而导致形 formed deep color powder copper 层, false chemical copper speed degree fast, that has can can is active liquid 污染引起. from chemical copper liquid formed separation and as conditions 失常引起 this category of fault/failure 发现, chemical copper liquid pH value high easy this category of fault/failure, therefore production in need control chemical copper liquid pH value (in 12 left right), 千万不 need is relatively fast copper speed degree, chemical copper solvent liquid pH value relatively high. chemical copper solvent liquid pH value control in 12 left right still deep color powder copper 层, that has can can is chemical copper liquid in need 补充络 combined agent, can dilute liquid, make chemical copper liquid temperature degree control in 30℃ below/following. this measures has troubleshooting this type of fault/failure.

        5. chemical 镀镍层 upper has black powder 末出现 this type of fault/failure causes main/primary is: chemical liquid temperature degree high or liquid pH value high, chemical liquid in acid and 次亚磷 acid content high and other. this factors make chemical solvent liquid reaction 剧烈, solvent liquid speed separation understanding, make solvent liquid in generate solid micro 粒, this micro 粒 夹人就 formed 镀镍层 in black powder 末. troubleshooting this category of fault/failure methods is: need control liquid pH value and liquid temperature degree, again analysis adjustment solvent liquid formed separation, rear chemical solvent liquid in solid micro 粒.

        6. plastics plating (copper or 镍) plastics parts surface plating main/primary is: 基体材 material, chemical front 工序, copper and and other 方面. plastics parts upper small and small 点, and other has can can plating 麻点; coarse from parts surface has small lubricating wet, active to chemical rear formed plating small 点, again rear electroplating formed 麻点;而 this is 以凹坑 形式存 in. remove this step/link generate 麻点就 is add strong/high 基体材 material front and chemical front 工序 处理. plastics parts in chemical rear electroplating copper and electroplating 镍工序也 is easy 出现麻点 step/link, copper use cationic sheet/plate, if amount low or high, cationic solvent understanding positive 常, easy generate oxidation copper pellets, 而导致镀 copper 层出现麻点. also has liquid in light agent or light agent separation understanding material and other 都会造 formed plating 麻点, this need control, from remove electroplating copper surface fault/failure. electroplating 镍层出现麻点 and liquid in iron 杂质, light agent separation understanding material, liquid pH value, wetting agent 不足, liquid in solid pellets and other has 关, need according to 第4章 in methods this type of plating fault/failure troubleshooting.