近些年來(lái)中國(guó)的經(jīng)濟(jì)發(fā)展迅速，鍍鋅鋼板是國(guó)內(nèi)消費(fèi)增長(zhǎng)速度較快的鋼材品種之一。

In recent years, China's economy has developed rapidly, and galvanized steel plate is one of the steel varieties with a rapid growth rate in domestic consumption.

為改善鍍鋅層耐蝕性能，一般都要對(duì)鍍鋅層進(jìn)行適當(dāng)?shù)拟g化處理，來(lái)提高鍍鋅層在環(huán)境中的熱力學(xué)穩(wěn)定性。鈍化處理屬一種化學(xué)鈍化膜技術(shù)，它是通過(guò)化學(xué)或電化學(xué)等手段，使金屬或鍍層表面由活潑態(tài)轉(zhuǎn)變?yōu)殁g化態(tài)的過(guò)程。實(shí)驗(yàn)結(jié)果表明：在鍍層表面采用化學(xué)方法生成一層鈍化膜，可以大大提高鋅鍍層的抗蝕性能。按照鋅鍍層出現(xiàn)紅銹（即鐵開(kāi)始遭受腐蝕）的時(shí)間來(lái)評(píng)價(jià)，鈍化膜的耐蝕性能相當(dāng)于13μm鋅鍍層的耐蝕性。

In order to improve the corrosion resistance of galvanized coating, it is generally necessary to improve the thermodynamic stability of galvanized coating in the environment. Passivation treatment is a chemical passivation membrane technology, it is the metal or coating surface from active state to passivation state through chemical or electrochemical means process. The experimental results show that the coating surface can greatly improve the corrosion resistance of the zinc coating. According to the time when the zinc coating appears red rust (i. e. iron starts to suffer corrosion), the corrosion resistance of the passivation film is equivalent to the corrosion resistance of 13 μ m zinc coating.

鈍化即是對(duì)鍍鋅板進(jìn)行鉻酸鹽鈍化處理可以形成鈍化膜，溶液鈍化族中的三價(jià)鉻難溶于水，化學(xué)性質(zhì)不活潑，起骨架作用，而其中的六價(jià)鉻易溶于水，能在鈍化膜劃傷時(shí)起到再鈍化的作用，具有鈍化膜的治愈作用。因此，在一定限度內(nèi)，鈍化膜能防止蒸汽或潮濕空氣直接侵蝕鍍鋅板，起保護(hù)作用。

Passivation is the chromate passivation treatment of galvanized plate can form a passivation film, the trivalent chromium in the solution passivation group is insoluble in water, the chemical properties are not active, play the skeleton role, and the hexavalent chromium is easily soluble in water, can play the role of passivation when the passivation film is scratched, has the healing effect of passivation film. Therefore, within a certain limit, passivation film can prevent steam or humid air directly erosion of galvanized plate, play a protective role.