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鍍鋅層三價鉻鈍化在防腐蝕能力上無法滿足一些工件高防腐蝕性能的要求,為此,采用鋅鎳合金進行三價鉻鈍化,通過鹽霧試驗考察了其防腐蝕能力。鈍化液主要成分:77g/LCr(NO3)3.9H2O,13g/L(COOH)2,15g/LCH2(COOH)2,2g/L馬來酸酐,8g/LCo(NO3)2.6H2O,5mL/L含硅化合物。結(jié)果表明,控制pH值在1.6~2.0,溫度60~70℃,時間30s以上,所得鈍化膜防腐蝕能力超過常規(guī)鍍鋅六價鉻鈍化膜。鋅鎳鍍層三價鉻鈍化既保護了環(huán)境,又能滿足工件高防腐蝕性能的要求。
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Designation: A 743/A 743M –03 Standard Speci?cation for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application 1 This standard is issuedunder the ?xed designation A 743/A 743M; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year