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采用SEM、电化学性能、EDS和XRD等手段,对空调通风管道用热镀锌钢板在不同pH值溶液中的腐蚀形貌和电化学性能进行了研究。结果表明,表面镀锌层与基体钢板结合良好,镀锌层厚度约在65μm左右;在pH值从12.5上升至13.5过程中,自腐蚀电流密度加大,钢板的耐腐蚀性能降低;热镀锌钢板从基材至镀锌层分别为Fe元素(α-Fe)、Fe_3Zn_(10)相(Г)、FeZn_7相(δ)、FeZn_(13)相(ζ)和Zn层(η);热镀锌钢板的腐蚀产物主要为ZnO和片状晶体Ca[Zn(OH)_3]_2·2H_2O。
The corrosion morphology and electrochemical performance of hot-dip galvanized steel sheet for air-conditioning ventilation ducts in different pH solutions were studied by means of SEM, electrochemical properties, EDS and XRD. The results show that the surface galvanized layer is well bonded with the substrate steel and the thickness of galvanized layer is about 65μm. When the pH value increases from 12.5 to 13.5, the self-corrosion current density increases and the corrosion resistance of the steel sheet decreases. The steel plate is Fe element (α-Fe), Fe_3Zn_ (10) phase (Γ), FeZn_7 phase (δ), FeZn_13 phase (ζ) and Zn layer The corrosion products of zinc plate are mainly ZnO and lamellar Ca [Zn (OH) 3] 2 · 2H 2 O.