镀锌钢在模拟海洋大气环境下的腐蚀行为

Corrosion Behavior of Galvanized Steel in Simulated Ocean Atmosphere

通过盐雾/干燥循环加速腐蚀实验模拟海洋大气腐蚀过程,采用宏观形貌观察、电化学测试、X射线衍射(XRD)、扫描电镜(SEM)和能谱(EDAX)等分析手段,研究镀锌钢在模拟海洋大气环境下的腐蚀行为和机理。结果表明:随着腐蚀时间的延长,镀锌钢的耐蚀性先降低后升高,最后再降低;当黄锈刚出现时,试样的耐蚀性有所提升,同时在腐蚀过程中出现双锈层,但最后又消失。

A alternate salt-spray/dry accelerated corrosion facility was set up to simulate the corrosive ocean atmosphere and then with which the corrosion behavior of galvanized steel was studied by means of electrochemical measurement, XRD, SEM and EDAX analysis. The results show that the corrosion resistance of galvanized steel varied with the progress of corrosion process, which declined firstly at the beginning stage, then ascended in the intermediary stage and declined again in the final stage. Correspondingly a yellow rust composed mainly of α- Fe OOH appeared firstly,which induced positive effect on the corrosion resistance of galvanized steel, later corrosion products γ- Fe OOH and β- Fe OOH successively appeared, which induced negative effect on the corrosion resistance of galvanized steel.