Qhov chaw raug rau ntau yam kev ntxhov siab hauv cov ntawv thov tiag tiag. Tej zaum nws yuav yog corroded los ntawm lwm qhov chaw, tshuaj lom neeg, cov kuab tshuaj, lossis ib puag ncig. Qhov chaw kuj tseem tuaj yeem hnav sai dua thaum ua haujlwm vim tias nws yuav raug coj los ua kev sib txhuam lossis kev sib txhuam.
Txhawm rau txuas ntxiv kev pabcuam lub neej ntawm ib feem thiab tiv thaiv corrosion, lwm cov khoom siv hlau tuaj yeem yog plated ntawm ib feem. Txoj kev plating no hu ua electroplating. Siv cov txheej txheem electrolysis, ib txheej ntxiv ntawm lwm cov hlau yog hluav taws xob txuas rau saum npoo ntawm ib feem. Ntxiv rau kev muab kev kho corrosion tsis kam thiab ua kom cov electroplating tuaj yeem txhim kho kev ua haujlwm ntawm ib feem, ua rau nws muaj zog ntau dua, lossis txhim kho nws cov tsos.
Ntau hom ntawm cov hlau tuaj yeem siv rau cov txheej txheem electroplating. Nickel, chromium, thiab zinc tau siv dav siv, nyob ntawm kev lag luam thiab lub hom phiaj ntawm ib feem. Txhua tus hlau muaj nws cov txiaj ntsig thiab qhov tsis zoo. Cia peb saib qhov sib txawv ntawm zinc plating, chrome plating, thiab npib tsib xee plating.
Zinc plating
Ntxiv rau kev ua kom tsis kam txais alkalis, sulfides, thiab acids, Zinc plating kuj tseem muaj kev tiv thaiv corrosion zoo heev. Cov hlau no tseem muaj cov kws kho tshuab zoo zog. Vim tias nws yog cov hlau ruaj khov, nws feem ntau siv rau hauv cov chaw noo thiab kub. Txij li cov khoom siv Zinc muaj ntau thiab yooj yim rau cov txheej txheem, tus nqi qis. Txawm li cas los xij, nws yuav tsum tau sau tseg tias galvanizing tsis haum rau ntu nrog kev sib txhuam siab. Nws feem ntau siv nyob rau hauv ntau cov ntawv thov los tiv thaiv qhov chaw ntawm xeb.
Cov Kev Siv Raug:
Anti-corrosion ntawm steel seem: xws li tsheb bolts, scaffolding, thiab sab nraum zoov anode tiv thaiv ntawm zinc txheej kom tiv thaiv cov txheej txheem).
Tsawg-thauj khoom: xws li springs thiab gaskets (tus nqi qis tab sis tsis hnav-resistant).
Qhov zoo thiab qhov tsis zoo:
Cov nqi siab ua tau zoo, haum rau loj-teev tawm tsam kev xav tau ntawm corrosion;
Tsawg tawv hardness, tsis haum rau kev txhuam cov scriction, yooj yim rau oxidize ntawm qhov kub (zinc melting taw tes 419 degree).
Nickel Plating
Nickel plating yog ib qho khoom siv nyuaj nrog zoo corrosion tsis kam. Nws ib txwm yog plated ntawm tooj liab los txhim kho lub ntuj corrosion tsis kam ntawm tooj liab. Nickel tseem muaj kev cuam tshuam heev thiab siv rau cov hom phiaj zoo nkauj. Cov hlau no tuaj yeem txhim kho cov tsos ntawm cov hlau thiab txhim kho cov hnav tsis kam. Nickel yog cov hlau ntxeem tau, yog li ntau txheej yuav tsum tau plated ntawm lwm yam meters kom muaj kev tiv thaiv.
Cov Kev Siv Raug:
Hniav plating: xws li chav dej kho vajtse, tsheb ncu hauv sab hauv (ci ntsa iab + sealing los txhim kho kev ua kom loog).
Ua haujlwm txiav cov txheej txheem: cov hluav taws xob hluav taws xob (npib hluav taws xob muaj qhov nruab nrab thiab tuaj yeem siv ua ntaub qhwv hauv qab txheej), ua kom microses thiab corrosion tsis kam).
Daim txheej sib xyaw: cov ntaub ntawv npib tsib xee-phosphorus alloy nrog phosphorus, carbon, thiab lwm yam. (Amorphous qauv, siab dua hardness).
Qhov zoo thiab qhov tsis zoo:
Zoo gloss, acid acid corrosion tsis kam (xws li organic acid tsis kam);
Cov nqi siab, tuab heev thiab yooj yim rau puag, yuav tsum tau sib phim nrog hydrogen embrittlement.
Chrome plating
Chromium yog ruaj khov thaum raug rau qee cov kua qaub, carbonate sulfides, alkalis thiab huab cua dub. Cov hlau no muaj cov kub ua kom tsis kam, hnav zoo thiab hardness. Chrome plating tuaj yeem muab cov khoom nrog cov ris zoo tiv thaiv thiab lub teeb ua kom zoo. Txawm li cas los xij, chromium yog nkig heev thiab ntxeem tau. Chromium nws tus kheej tsis muab kev tiv thaiv corrosion zoo. Txawm li cas los xij, thaum nws ua ke nrog tooj liab thiab npib tsib xee, qhov txheej no tuaj yeem siv rau qhov chaw hauv cov chaw hauv kev xeb.
Cov Kev Siv Raug:
Hniav chrome plating: Tsheb log, rooj tog zaum (daim iav ua haujlwm, txhim kho qib kawm).
Hard chrome plating: tshuab hluav taws xob, piston rings, moulds (siab tawv + hnav tsis kam, kho cov khoom hnav).
Kev Siv Tshwj Xeeb: Aerospace feem (tiv taus cov kub kub oxidation, chromium melting point 1857 degree).
Qhov zoo thiab qhov tsis zoo:
Hardness siab tshaj plaws, hnav muaj zog heev thiab corrosion tsis kam;
Kev tiv thaiv siab ib puag ncig tus nqi, cov txheej txheem ntom ntom tam sim no yuav tsum tau kho nruj me ntsis), thiab cov txheej txuas tau yooj yim rau tawg kho mob).
Ntxiv rau cov hlau no, cadmium, tooj liab thiab Tin plating kuj tseem siv tau rau cov chaw muaj khoom. Cov khoom muaj txiaj ntsig xws li kub, nyiaj thiab platinum tseem tuaj yeem siv rau cov chaw elotcrated. Kub yog ib qho kev ua txhaum rau cov semiconductors thiab txuas rau hluav taws xob thiab kev lag luam hluav taws xob.
Yuav xaiv li cas?
Thaum xaiv cov hlau plating rau koj ib feem, xav txog kev siv ntawm ntu hauv daim ntawv thov tiag tiag thiab seb nws yuav cuam tshuam nrog ib puag ncig. Tom qab ntawd xaiv ib qho plating uas muab cov txiaj ntsig zoo.
Txiav txim siab corrosion tiv thaiv thiab tus nqi: xaiv zinc plating (xws li cov khoom sab nraum zoov).
Xav tau cov khoom dai kom zoo nkauj thiab nruab nrab corrosion: Xaiv npib tsib xee plating (xws li cov khoom siv hauv tsev, cov khoom huv). Taug qab cov hardness siab thiab hnav tsis kam: xaiv chrome plating (xws li cov neeg kho tshuab kis rau qhov chaw, pwm).
Cov Yuav Tsum Ua Si: Sib Txawv Hlau (xws li plating + Chrome + Chrome, gloss thiab hardness, siv rau lub tsheb log).