Ukwakheka kanye nendlela yokulwa nokugqwala ye-Dacromet coating

Kuthunyelwe ku 2018-12-22Isixazululo sokwelashwa kwe-Dacromet yisisombululo samanzi esihlakazekayo esakhiwe ama-zinc flakes, ama-aluminium flakes, i-anhydrous chromic acid, i-ethylene glycol, i-zinc oxide, njll., enobubanzi obungama-micrometers amane kuya kwamahlanu kanye nogqinsi lwama-micrometers amane kuya kwamahlanu.Ngemuva kokuthi ucezu lokusebenzela olulashiwe lucwilisiwe noma lufuthwe oketshezini lokwelapha, ingaphezulu le-workpiece linamathela kancane ngoketshezi lokumboza, bese lishiswa kuze kufike ku-300 ° C esithandweni sokuphulukisa ukwenza i-chromium ene-hexavalent kungqimba lokumboza Indaba ephilayo. njenge-ethylene glycol iyancipha ukuze yakhe i-water-insoluble, i-amorphous nCrO3 kanye ne-mCr2O3.Ngaphansi kwesenzo salo, ishidi le-zinc neshidi le-aluminium kuhlanganiswe ndawonye, ​​futhi inqwaba yezendlalelo zipakishwe ebusweni bomsebenzi wokusebenza.I-coating, kanye ne-anhydrous chromic acid embotsheni ye-Dacromet, i-oxidize ingaphezulu le-workpiece ukuze kuthuthukiswe ukunamathela kwe-coating ebusweni bomsebenzi.
Indlela yokuvimbela ukugqwala ye-Dacromet coating ngokuvamile ibhekwa njengelandelayo:
1. Ukuvikelwa kokuzidela okulawulwayo kwe-zinc powder;
2. I-chromic acid yenza ifilimu ye-oxide eminyene ebusweni bomsebenzi ongagqwali kalula ngesikhathi sokucubungula;
3. I-coating ehlanganisa amashumi ezingqimba ze-zinc kanye namashidi e-aluminium yakha umsebenzi wokuvikela, okwandisa ukufika kwesigebengu phezu kwendawo yokusebenza.
Indlela edlulile.I-Electro-galvanizing ihlanganiswe ngokuqondile nongqimba lwe-zinc ebusweni bensimbi.I-Corrosion current igeleza kalula phakathi kwezingqimba.Ikakhulukazi endaweni yesifutho sikasawoti, amandla okuvikela ancishiswa kakhulu ukwenza i-zinc idle kalula.Ukugqwala okumhlophe kukhiqizwa esigabeni sokuqala sokucubungula.Noma ukugqwala okubomvu.Ukwelashwa kwe-Dacromet kuqukethe ucezu lweshidi le-zinc elimbozwe izinhlanganisela ze-chromic acid, futhi ukuqhutshwa kwe-conductivity kumaphakathi, ngakho-ke kunokumelana nokugqwala okuhle kakhulu.Amashidi ezinc ambozwe yizingqimba abekwe phezulu ukuze enze isivikelo, futhi izinga lokuna kwe-zinc lilawulwa ngisho nasekuhlolweni kwesifutho sikasawoti.Ngaphezu kwalokho, njengoba inhlanganisela ye-chromic acid kufilimu eyomile ye-Dacromet ayinawo amanzi ayikristalu, ukumelana kwayo nokushisa okuphezulu nokumelana nokugqwala ngemuva kokushisa nakho kuhle.