(1. 中國科學院 金屬研究所，沈陽 110016；
2. 廣東電網(wǎng)公司 電力科學研究院，廣州 510080)
摘 要: 利用自制的降雨噴淋裝置模擬Zn在酸雨條件下的大氣腐蝕行為，采用掃描電鏡(SEM)、X 射線能譜(EDS)、X 射線衍射(XRD)和電化學測試技術(shù)分別研究Zn腐蝕48、96、144、192和240 h后的腐蝕產(chǎn)物成分、銹層截面形貌以及表面銹層的電化學特性，分析了銹層對Zn腐蝕行為的影響。結(jié)果表明：主要的腐蝕產(chǎn)物為Zn(OH)2、ZnSO4、Zn4SO4(OH)6·3H2O和Zn5(OH)8Cl2·H2O；腐蝕過程中，Zn的表面形成了具有較好保護性的銹層，隨著腐蝕時間的延長，銹層對Zn的保護作用先增強后減弱。
關(guān)鍵字: 模擬酸雨；大氣腐蝕；腐蝕產(chǎn)物；電化學技術(shù)
（1. Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. Electric Power Research Institute, Guangdong Power Grid Corporation, Guangzhou 510080, China）
Abstract:The corrosion behavior of Zn in simulated acid rain atmospheric environment was studied with a simulating raining system self-designed, which can control rainfall and pressure close to the actual level. After zinc corroded in simulated acid rain atmospheric environment corrosion time of 48, 96, 144, 192 and 240 h, the morphologies and the composition of corrosion products, cross section of rust layers and the electrochemical characters of rust layers were investigated by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray diffractometry (XRD) and electrochemical techniques. The results show that the corrosion products formed on the surface of zinc have good protection, but the degree of protection is limited, with the main product components for Zn(OH)2, ZnSO4, Zn4SO4(OH)6·3H2O and Zn5(OH)8Cl2·H2O. The protective effect of the rust layers is first enhanced, and then weakened as increasing the corrosion time.
Key words: simulated acid rain; atmospheric corrosion; corrosion products; electrochemical technique;
