Plaub Qhov Tseem Ceeb Rau Electroplating Ntawm Ntsia Hlau Fasteners

Feem ntauntsia hlau fastenersyuav tsum tau kho deg electroplating. Electroplating tsis tsuas yog txhim kho cov tsos ntawm fasteners tab sis kuj zoo txhim kho lawv cov xeb tsis kam thiab corrosion kuj. Qhov zoo ntawm electroplated coatings yog tsuas yog ntsuas los ntawm cov tsos thiab corrosion kuj. Corrosion kev ua tau zoo raug txheeb xyuas los ntawm kev ntsuas ntsev tsuag uas simulate cov kev pabcuam tiag tiag. Qhov ua tiav zoo ntawm electroplated fasteners yog nruj me ntsis tswj nyob rau hauv plaub yam tseem ceeb hauv qab no.

1. Electroplating Appearance Requirements

Electroplated nto yuav tsum tsis muaj ib feem uas ploj lawm txheej, hlawv, roughness, dullness, tev, crusting thiab pom tseeb streaks. Qhov tsis xws luag xws li pinholes, pits, dub plating residues, xoob passivation films, tawg, zaj duab xis tev thiab cov cim passivation hnyav yog txwv tsis pub. Tag nrho cov txheej yuav tsum yog uniform, huv si thiab zoo ib yam ntawm cov xim.

2. Txheej Thickness yuav tsum tau

Lub neej kev pab cuam ntawm fasteners nyob rau hauv corrosive ib puag ncig yog zoo correlated nrog txheej thickness. Qhov pom zoo kev lag luam thickness rau cov pa electroplated txheej yog li ntawm 4 mus rau 12 μm (0.00015 rau 0.0005 nyob rau hauv).

Kub-dip galvanizing thickness qauv: Rau fasteners nrog lub nominal txoj kab uas hla me dua 3/8 nti, qhov nruab nrab txheej thickness yuav tsum tsis pub tsawg tshaj 54 μm thiab qhov tsawg kawg nkaus thickness tsis tsawg tshaj li 43 μm. Rau fasteners nrog lub nominal txoj kab uas hla ntawm 3/8 nti los yog loj, qhov nruab nrab txheej thickness yuav tsum tsis muaj tsawg tshaj li 43 μm thiab qhov tsawg kawg nkaus thickness tsis tsawg tshaj li 37 μm.

3. Txheej Distribution Uniformity Requirements

Cov txheej txheem sib txawv ntawm cov txheej txheem plating muaj cov yam ntxwv sib txawv ntawm cov hlau deposition, uas ua rau cov txheej txheem sib txawv ntawm cov khoom siv fastener. Hauv cov pa electroplating, hlau deposition tsis sib xws. Ntug thiab cov ces kaum zoo li tsim cov txheej tuab. Nyob rau hauv threaded seem, lub txheej yog thickest ntawm cov xov crest, maj mam thinner nyob rau hauv xov flank, thiab thinnest ntawm cov xov hauv paus.

Kub-dip galvanizing nthuav tawm qhov sib txawv ntawm kev faib tawm: cov txheej txheej tuab dua rau ntawm cov ces kaum sab hauv thiab xov hauv paus. Mechanical galvanizing ua raws li cov qauv deposition zoo ib yam li kub-dip galvanizing, tsis tau ua kom smoother nto thiab ho ntau uniform txheej thickness thoob plaws tag nrho ib feem.

4. Hydrogen embrittlement tiv thaiv yuav tsum tau

Thaum lub sij hawm pickling, degreasing thiab electroplating txheej txheem, fastener nto tau yooj yim nqus hydrogen atoms, uas ua rau hauv qab cov hlau txheej. Thaum lub fastener yog nruj nreem, concentrated kev nyuaj siab tsav hydrogen mus rau high-kev nyuaj siab cheeb tsam, generating ntau sab hauv siab thiab pib microcracks. Cov nquag nquag hydrogen tsis tu ncua nkag mus rau cov kab nrib pleb tshiab, tsim kom muaj lub voj voog tsis ua haujlwm ntawm lub siab tsub zuj zuj, tawg kev nthuav tawm thiab hydrogen infiltration, uas thaum kawg ua rau nkig puas. Qhov kev ua tsis tiav no feem ntau tshwm sim hauv ob peb teev tom qab thawj daim ntawv thov thauj khoom.

Txhawm rau tshem tawm hydrogen embrittlement txaus ntshai,fastenersyuav tsum tau ci tam sim ntawd tom qab electroplating tso tawm sab hauv hydrogen. Cov txheej txheem ci txheej txheem yog ua nyob rau ntawm 176-190℃(375-400 ℉) rau 3-24 teev kom tag nrho diffuse hydrogen thiab tiv thaiv embrittlement puas.

Hauv cov ntsiab lus, cov tsos mob tsis zoo, tsis ua raws li txheej txheej thickness, tsis sib xws txheej faib thiab hydrogen embrittlement txaus ntshai yog plaub lub ntsiab ua rau tsis tsim nyog electroplated fasteners thiab yuav tsum tau tswj nruj me ntsis thaum lub sij hawm tsim khoom.