Kev daws teeb meem ntawm Tsawg Chromium Passivation hauv Electroplating Galvanizing ntawm Hluav Taws Kub Kub Tubes

Kev daws teeb meem ntawm Tsawg Chromium Passivation hauv Electroplating Galvanizing ntawm Hluav Taws Kub Kub Tubes

Txij li thaum nruab nrab -1970s, qhov qis chromium passivation ntawm zinc plating tau raug txo los ntawm 1809 / L thiab 40glL siab chromium theem nrab passivation rau cov txheej txheem tshiab ntawm 2-59/L tsawg chromium passivation. Kev tiv thaiv corrosion ntawm cov zaj duab xis passivation tuaj yeem ncav cuag qhov kev tiv thaiv corrosion ntawm siab chromium passivation, ua ntej daws qhov teeb meem ntawm ib puag ncig muaj kuab paug. Tsab ntawv xov xwm no nthuav tawm cov kev ua yeeb yaj kiab ntau yam tsis xws luag, ua rau, thiab txoj kev kho mob ntawm cov xim chromium tsawg passivation thiab dawb passivation.

Feem ntau faults thiab kev daws rau xim passivation

1.1 Cov txheej zaj duab xis tsis ci thiab muaj pos huab zoo li

1.1.1 Ua rau

(1) Nitric acid tsis emit teeb;

(2) Muaj nitric acid thiab chromic acid tsawg dhau hauv cov tshuaj passivation;

(3) Ntau dhau ntawm cov trivalent chromium thiab zinc ions qhia tias cov tshuaj passivation muaj hnub nyoog;

(4) Tom qab passivation, cov dej ntxuav muaj ntau cov tshuaj chloride ions, los yog cov dej yaug lub tank uas tau dhau los ua dawb passivation yog siv.

1.1.2 Cov txheej txheem tuav

(1) Hloov lub teeb daws teeb meem;

(2) Ntxiv qhov tsim nyog ntawm nitric acid thiab chromic acid los kho;

(3) Rov qab npaj cov tshuaj passivation, thiab cov tshuaj qub tuaj yeem impregnated nrog 732 cation txauv resin hauv hnab. Tom qab tshem tawm C expansion thiab ZnZ los ntawm kev daws, nws tuaj yeem rov qab siv dua. Nws tseem yog qhov zoo tshaj plaws los siv txoj kev no rau kev kho impregnation tsis tu ncua kom ntev lub neej kev pab cuam ntawm cov tshuaj passivation;

(4) Hloov cov dej ntxuav thiab tsis txhob siv cov xim dawb passivation rinsing dab dej los ntxuav cov xim passivation qhov chaw.

1.2 Zaj duab xis txheej tsis ruaj khov thiab yooj yim los so

1.2.1 Ua rau

(1) Tus nqi pH ntawm cov tshuaj passivation tsawg;

(2) Lub sijhawm ua haujlwm ntev passivation;

(3) Qhov saum npoo ntawm zinc txheej adsorbs ib txheej ntawm cov organic teeb meem;

(4) Qhov passivation nyob twj ywm nyob rau hauv huab cua ntev heev tom qab tawm hauv lub qhov.

1.2.2 Cov txheej txheem ua

(1) Kho tus nqi pH ntawm cov tshuaj passivation. Feem ntau, pH tus nqi ntawm cov tshuaj uas tau npaj tshiab passivation feem ntau qis. Ib qho me me ntawm sodium hydroxide tuaj yeem muab ntxiv kom nce pH tus nqi ntawm cov tshuaj mus rau qis qis ntawm cov txheej txheem ntau. Thaum tus nqi pH siab dhau lawm, sulfuric acid tuaj yeem ntxiv rau kev hloov kho;

(2) Ua kom luv lub sij hawm passivation thiab tuav lub sij hawm rau lub workpiece los tsim ib zaj duab xis nyob rau hauv cov kua. Feem ntau, thaum pH tus nqi qis dua, lub sijhawm ua haujlwm luv dua. Hloov pauv, yog tias lub sijhawm ntev dua, zaj duab xis tsim lub sijhawm hloov pauv nrog tus nqi pH thiab tsis tuaj yeem kho;

(3) Ib qho 5 feem pua ​​​​sodium hydroxide tov tuaj yeem siv rau kev tshem tawm zaj duab xis, ua raws li passivation tom qab ntxuav;

(4) Ua kom luv lub sijhawm nyob ntawm qhov chaw nyob hauv huab cua.

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