CAJ | 학술논문

研究压铸AZ91D镁合金在不同pH值的0.1 mol/LNa2S04溶液中的腐蚀行为,利用SEM、FTIR及XRD等手段对压铸AZ91D镁合金在Na2S04溶液中的腐蚀速率、腐蚀产物形貌和腐蚀产物组分进行定量和定性分析.结果表明:压铸AZ91D镁合金在不同pH值Na2SO4溶液中的腐蚀速率顺序从高到低依次为pH 2,pH 4,pH 7,pH 9,pH 12,酸性溶液的腐蚀速率大于碱性溶液的腐蚀速率;在Na2S04溶液中,腐蚀产物主要为Mg(OH)2和MgAl2(SO4)4·22H2O,不同的pH值能改变腐蚀速率和腐蚀产物形貌:氯离子和硫酸根离子有不同的点蚀引发时间.
연구압주AZ91D미합금재불동pH치적0.1 mol/LNa2S04용액중적부식행위,이용SEM、FTIR급XRD등수단대압주AZ91D미합금재Na2S04용액중적부식속솔、부식산물형모화부식산물조분진행정량화정성분석.결과표명:압주AZ91D미합금재불동pH치Na2SO4용액중적부식속솔순서종고도저의차위pH 2,pH 4,pH 7,pH 9,pH 12,산성용액적부식속솔대우감성용액적부식속솔;재Na2S04용액중,부식산물주요위Mg(OH)2화MgAl2(SO4)4·22H2O,불동적pH치능개변부식속솔화부식산물형모:록리자화류산근리자유불동적점식인발시간.
The corrosion behaviours of die-cast AZ91D magnesium alloys were investigated in 0.1 mol/L sodium sulphate (Na2SO4) solutions with different pH values. The corrosion rates, morphologies, and compositions of the corrosion products were studied by means of scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and X-ray diffractometry (XRD). The results indicate that the order of corrosion rates in Na2SO4 solutions with various pH values is pH 2>pH 4>pH 7>pH 9>pH 12. The corrosion rates in acidic solutions are higher than those in alkaline solutions, and the corrosion products are mainly magnesium influence the corrosion rate and morphology of corrosion products. Chloride ions and sulphate ions have different pitting initiation time.