Daaweynta biyaha wasakhda ah ee ka kooban chromium ee electroplating

Isbarbardhigga saamaynta daaweynta ee ferrous sulfate iyo sodium bisulfite

Habka wax soo saarka electroplating-ka waa in la galiyey, habka nadiifinta galiyeylkana, asal ahaan warshadda electroplating-ka waxay isticmaali doontaa chromate, sidaa darteed biyaha wasakhda ah ee electroplating-ku waxay soo saari doonaan tiro badan oo biyo wasakh ah oo chromium ka kooban sababtoo ah dahaadhka chromium. Chromium-ka ku jira biyaha wasakhda ah ee ay ku jirto chromium wuxuu ka kooban yahay chromium hexavalent, kaas oo ah sun ah oo ay adag tahay in laga saaro. Chromium hexavalent badanaa waxaa loo beddelaa chromium trivalent oo laga saaraa. Si looga saaro biyaha wasakhda ah ee electroplating-ka ku jira chrome-ka, xinjirowga kiimikada iyo roobabka ayaa badanaa loo isticmaalaa in laga saaro. Caadiyan waxaa loo isticmaalaa habka roobka ee ferrous sulfate iyo lime iyo habka sodium bisulfite iyo alkali yaraynta roobka.

1. Habka roobka ee birta sulfate iyo liinta

Ferrous sulfate waa isku-xidhka aashitada xooggan oo leh sifooyin xooggan oo yareeya oksaydhka. Ferrous sulfate waxaa si toos ah loogu yareyn karaa iyadoo la isticmaalayo hexavalent chromium ka dib marka la isku shubo biyaha wasakhda ah, iyadoo loo beddelayo qayb ka mid ah isku-xidhka chromium saddex-geesoodka ah iyo roobka, ka dibna lagu daro lime si loo hagaajiyo qiimaha pH ilaa qiyaastii 8~9, si ay uga caawiso falcelinta isku-xidhka inay soo saarto roobabka chromium hydroxide, saameynta ka saarista chromate waxay gaari kartaa qiyaastii 94%.

Da'itaanka chromate-ka ferrous sulfate iyo lime-ka ayaa saameyn wanaagsan ku leh ka saarista chromium iyo kharash yar. Marka labaad, looma baahna in la hagaajiyo qiimaha pH ka hor inta aan lagu darin ferrous sulfate, waxaana loo baahan yahay oo keliya in lagu daro lime si loo hagaajiyo qiimaha pH. Si kastaba ha ahaatee, sababtoo ah xaddiga badan ee qiyaasta ferrous sulfate ayaa sidoo kale sababay koror weyn oo ku yimaada dhoobada birta, taasoo kordhisay kharashka daaweynta dhoobada.

2,.sodium bisulfite iyo habka roobka ee yaraynta alkali

Sodium bisulfite iyo chromate-ka roobka ee yareeya alkali, pH-ga biyaha wasakhda ah ayaa loo hagaajiyaa ≤2.0. Kadib sodium bisulfite ayaa lagu daraa si loo yareeyo chromate-ka una beddelo chromium saddex-jibbaaran, biyaha wasakhda ahna waxay galaan barkadda dhammaystiran ka dib marka la dhammeeyo dhimista, biyaha wasakhda ah waxaa lagu shubaa barkadda nidaamisa si loo hagaajiyo, qiimaha pH-na waxaa loo hagaajiyaa ilaa 10 iyadoo lagu darayo qanjidhada alkali, ka dibna biyaha wasakhda ah waxaa lagu shubaa taangi si loo soo saaro chromate-ka, heerka ka saaristana wuxuu gaari karaa ilaa 95%.

Habka loo isticmaalo sodium bisulfite iyo yaraynta alkali chromate roobka ayaa ku fiican ka saarista chromium, kharashkeeduna waa mid ka sarreeya ferrous sulfate, waqtiga falcelinta daaweyntuna waa mid aad u dheer, qiimaha pH-na waa in lagu hagaajiyaa aashito ka hor daaweynta. Si kastaba ha ahaatee, marka la barbardhigo daaweynta ferrous sulfate, asal ahaan ma soo saarto wasakh aad u badan, taasoo si weyn u yareyneysa kharashka daaweynta dhoobada, dhoobada la daaweeyayna badanaa dib ayaa loo isticmaali karaa.