Daawaynta biyaha wasakhda ah ee ay ku jiraan chromium ee ku jira korantada

Isbarbardhigga saamaynta daawaynta ee ferrous sulfate iyo sodium bisulfite

Habka wax-soo-saarka korantada wuxuu u baahan yahay in la galvanized, iyo habka nadiifinta galvanized, asal ahaan warshadda korantada waxay isticmaali doontaa chromate, sidaas darteed biyaha wasakhda ah ee korantada ayaa soo saari doona tiro badan oo ah qashinka chromium-ka kooban sababtoo ah chromium plating.Chromium-ka ku jira biyaha wasakhda ah ee ka kooban chromium waxa ku jira chromium hexavalent, kaas oo sun ah oo ay adagtahay in la saaro.chromium hexavalent waxaa badanaa loo beddelaa chromium trivalent waana laga saaraa.Si meesha looga saaro chrome-ka ku jira biyaha wasakhda ah ee korantada, xinjirowga kiimikada iyo roobka ayaa inta badan loo isticmaalaa si looga saaro.Sida caadiga ah loo isticmaalo waa ferrous sulfate iyo habka hoos u dhigista lime iyo habka hoos u dhigista roobka sodium bisulfite iyo alkali.

1. ferrous sulfate iyo habka hoos u dhigista lime

Ferrous sulfate waa xinjiraha aashitada oo xoog leh oo leh sifooyin yareynaya oksaydheynta.Ferrous sulfate si toos ah ayaa loo dhimi karaa chromium hexavalent ka dib hydrolysis ee biyaha wasakhda ah, u beddelashada qayb ka mid ah xinjirowga chromium trivalent iyo roobka, ka dibna lagu daro lime si loo hagaajiyo qiimaha pH ilaa 8 ~ 9, si ay u caawiso falcelinta xinjirowga waxay dhalisaa roobka chromium hydroxide, saamaynta saarista chromate waxay gaari kartaa ilaa 94%.

Ferrous sulfate iyo xinjirowga lime dhimista roobka chromate-ka ayaa saameyn wanaagsan ku leh ka saarista chromium iyo qiimo jaban.Marka labaad, looma baahna in la hagaajiyo qiimaha pH ka hor inta aan lagu darin ferrous sulfate, oo kaliya ayaa loo baahan yahay in lagu daro lime si loo hagaajiyo qiimaha pH.Si kastaba ha ahaatee, sababtoo ah qadarka weyn ee qiyaasta sulfate ee ferrous waxay sidoo kale sababtay koror weyn oo dhoobada birta ah, kordhinta kharashka daaweynta dhoobada.

2,.sodium bisulfite iyo habka hoos u dhigista alkali

Sodium bisulfite iyo chromate roobabka yareeya, pH ee biyaha wasakhda ah waxaa lagu hagaajiyaa ≤2.0.Ka dib sodium bisulfite ayaa lagu daraa si loo yareeyo chromate ilaa chromium trivalent, iyo biyaha wasakhda ah waxay galaan barkadda dhamaystiran ka dib dhimista ka dib, biyaha wasakhda waxaa lagu shubaa barkada nidaaminta si loo hagaajiyo, qiimaha pH waxaa lagu hagaajiyaa ilaa 10 iyadoo lagu darayo alkali noodhadhka, ka dibna biyaha wasakhda ah ayaa lagu sii daayaa haanta seedimentation si ay u soo dedejiso chromate, iyo heerka saarista wuxuu gaari karaa ilaa 95%.

Habka sodium bisulfite iyo chromate roobka yaraynta alkali waxay u fiican tahay saarista chromium, kharashkeeduna waa ka sarreeyaa sulfate-ka ferrous, wakhtiga falcelinta daawayntana way ka dheertahay, qiimaha pH-ga wuxuu u baahan yahay in lagu hagaajiyo aashito ka hor daaweynta.Si kastaba ha ahaatee, marka la barbar dhigo daawaynta ferrous sulfate, asal ahaan ma soo saarto dhoobo aad u badan, si weyn u yaraynaysa kharashka daaweynta dhoobada, iyo dhoobada la daweeyay ayaa badanaa dib loo isticmaali karaa.