... Trong cuc sng hng ngy, chỳng ta thng s dng cỏc dng c, thit b c lm bng g, kim loi, cht do.Vt liu kim loi tip xỳc vi mụi trng n mũn, nc, khụng khớ s b oxi húa v n mũn, c bit mụi trng vựng bin kim ... s dng mt lng ln kim loi.Theo s lng thng kờ, lng kim loi (bao gm st thộp v kim loi mu ) b n mũn quỏ trỡnh in húa chim 1.74.5 GDP cỏc nc hay núi cỏch khỏc hng nm cú 10-15% lng kim loi b phỏ hy ... ngh bo v kim loi ú cú phng phỏp bo v bng lp ph.Trờn thc t cú phng phỏp ln c s dng l dựng lp ph bng kim loi (trỏng crom,trỏng thic,),lp ph bng hp cht húa hc v lp ph bng phi kim (men ,sn) Trong ú...