Phosphate coatings yog dab tsi

Phosphate coatings yog siv los ua kom corrosion kuj thiab txhim kho hmoov xim adhesion, thiab yog siv rau steel qhov chaw rau corrosion kuj, lubrication, los yog ua lub hauv paus rau cov txheej txheem tom ntej los yog painting. nrog rau saum npoo ntawm qhov yog coated los ua ib txheej ntawm insoluble, crystalline phosphates.Phosphate hloov dua siab tshiab coatings kuj siv tau rau txhuas, zinc, cadmium, nyiaj thiab tin.
Lub ntsiab hom phosphate coatings yog manganese, hlau thiab zinc.Manganese phosphates yog siv ob qho tib si rau corrosion kuj thiab lubricity thiab tsuas yog siv los ntawm immersion. Hlau phosphates feem ntau yog siv los ua lub hauv paus rau cov txheej txheem ntxiv lossis pleev xim thiab siv los ntawm kev tso dej los yog txau. Zinc phosphates yog siv rau xeb pov thawj (P&O), lub hauv paus roj nplua nyeem, thiab ua cov xim / txheej txheej thiab tuaj yeem siv los ntawm kev tso dej los yog txau.
Ib txheej phosphate yog txheej hloov pauv hauv sevral hwm. Nws yog tsawg dua li cov hlau feem ntau tab sis ntom dua li cov coatings. Nws muaj thermal expansion zog uas yog nruab nrab ntawm cov hlau thiab txheej. Qhov tshwm sim yog tias cov phosphate txheej tuaj yeem ua rau cov kev hloov pauv sai sai hauv thermal expansion uas yuav tsis muaj nyob nruab nrab ntawm cov hlau thiab cov xim. Phosphate txheej yog ntxeem tau thiab nqus tau cov txheej. Thaum kho, cov xim solidifies, xauv rau hauv phosphate pores. Adhesion tau zoo heev.

STAGE PHOSPHATE SPRAY PROCESS

1. Ua ke tu thiab phosphating. 1.0 mus rau 1.5 feeb ntawm 100 degrees F rau 150 degrees F.
2. Dej yaug 1/2 feeb
3. Chromic acid yaug los yog deionized dej yaug. 1/2 feeb.