Ukwelashwa kwamanzi amdaka aqukethe i-chromium ekufakweni kwe-electroplating

Ukuqhathaniswa kwemiphumela yokwelashwa kwe-ferrous sulfate kanye ne-sodium bisulfite

Inqubo yokukhiqizwa kwe-electroplating idinga ukuhlanganiswa, futhi enkambisweni yokuhlanzwa kwe-galvanized, ngokuyisisekelo isitshalo se-electroplating sizosebenzisa i-chromate, ngakho-ke amanzi angcolile e-electroplating azokhiqiza inani elikhulu lamanzi angcolile aqukethe i-chromium ngenxa ye-chromium plating. I-chromium emanzini angcolile aqukethe i-chromium iqukethe i-hexavalent chromium, enobuthi futhi kunzima ukuyisusa. I-hexavalent chromium ivame ukuguqulwa ibe yi-trivalent chromium bese isuswa. Ukuze kususwe amanzi angcolile e-electroplating aqukethe i-chrome, kuvame ukusetshenziswa ukuhlangana kwamakhemikhali kanye ne-precipitation ukuze kususwe. Ngokuvamile kusetshenziswa indlela ye-ferrous sulfate kanye ne-lime reduction precipitation kanye ne-sodium bisulfite kanye ne-alkali reduction precipitation method.

1. indlela yokunciphisa imvula ye-ferrous sulfate kanye ne-lime

I-ferrous sulfate iyi-coagulant enamandla ye-asidi enezakhiwo ezinamandla zokunciphisa i-oxidation. I-ferrous sulfate ingancishiswa ngqo nge-hexavalent chromium ngemva kwe-hydrolysis emanzini angcolile, iyiguqule ibe yingxenye ye-trivalent chromium coagulation kanye ne-precipitation, bese ingeza i-lime ukuze ilungise inani le-pH libe cishe ngu-8 ~ 9, ukuze ingasiza ukusabela kwe-coagulation ukukhiqiza i-chromium hydroxide precipitation, umphumela wokususwa kwe-chromate ungafinyelela cishe ku-94%.

Ukunciphisa i-chromate ye-ferrous sulfate kanye ne-lime coagulant kunomphumela omuhle ekususweni kwe-chromium kanye nezindleko eziphansi. Okwesibili, asikho isidingo sokulungisa inani le-pH ngaphambi kokufaka i-ferrous sulfate, futhi kudingeka nje ukwengeza i-lime ukuze ulungise inani le-pH. Kodwa-ke, ngenxa yenani elikhulu lokulinganisa i-ferrous sulfate nakho kubangele ukwanda okukhulu kodaka lwensimbi, okwandisa izindleko zokwelashwa kodaka.

2,.indlela yokunciphisa imvula ye-sodium bisulfite kanye ne-alkali

I-sodium bisulfite kanye ne-alkali reduction precipitation chromate, i-pH yamanzi amdaka ilungiswa ibe yi-≤2.0. Bese kuthi i-sodium bisulfite ingezwe ukuze kuncishiswe i-chromate ibe yi-trivalent chromium, bese amanzi amdaka angena echibini eliphelele ngemva kokuba ukuncipha sekuqediwe, amanzi amdaka adonswa echibini elilawulayo ukuze kulungiswe, bese inani le-pH lilungiswa libe cishe yi-10 ngokungeza ama-alkali node, bese amanzi amdaka ekhishwa ethangini lokuthuthwa ukuze kuqhutshekwe ne-chromate, futhi izinga lokususa lingafinyelela cishe ku-95%.

Indlela ye-sodium bisulfite kanye ne-alkali reduction precipitation chromate ilungele ukususwa kwe-chromium, futhi izindleko zayo ziphakeme kakhulu kune-ferrous sulfate, futhi isikhathi sokusabela kokwelashwa side kakhulu, futhi inani le-pH lidinga ukulungiswa nge-acid ngaphambi kokwelashwa. Kodwa-ke, uma kuqhathaniswa nokwelashwa kwe-ferrous sulfate, empeleni ayikhiqizi udaka oluningi kakhulu, okunciphisa kakhulu izindleko zokwelashwa kodaka, futhi udaka oluphathwe kahle lungasetshenziswa kabusha.