(燕山大學 材料科學與化學工程學院， 秦皇島 066004)
摘 要: 通過SEM，XRD，EDS，鹽腐蝕試驗，熱腐蝕試驗和電化學測試等研究了鋅鋁鉻膜的防腐蝕性能與機理。結果表明，該膜層耐中性鹽腐蝕性能至少優(yōu)于鍍鋅鈍化層4倍。至于鋅鋁鉻膜層的抗腐蝕機理可能在于鋅和鋁粒子的電化學保護、鉻的表面鈍化和鋅鋁鉻化合物保護層的屏蔽等作用，3者的協(xié)同作用結果賦予該膜層優(yōu)異的耐腐蝕性能。
關鍵字: 鋅鋁鉻膜；達克羅；防腐性能；防腐機理
characteristics and mechanism of
zinc-aluminum-chromium coating
（College of Materials Science and Chemical Engineering，
Yanshan University，Qinhuangdao 066004, China）
Abstract:The anti-corrosion characteristics and mechanism of zinc-aluminum-chromium coating were studied by tests of salt immersion，salt spray and heat treatment test，and by examinations of electro-chemical impedance spectra，SEM，XRD and EDS. The results show that the coating is superior to electro-zinc plating in anti-corrosion. The corrosion prevention mechanism of zinc-aluminum-chromium coating may come from the controlled galvanic protection of zinc and aluminum particles，the passivation of the object surface by chromic acid，and the barrier effect of zinc，aluminum and chromium compound. The combination of the above effects provides superior anti-corrosion characteristics.
Key words: zinc-aluminum-chromium coating; Dacromet; anti-corrosion characteristics; corrosion protection mechanism
