摘要
通过在实验室进行土壤埋样试验,采用失重法、交流阻抗测试、扫描电镜(SEM)和X射线衍射(XRD),研究了AZ63镁合金牺牲阳极在我国库尔勒地区的腐蚀行为。结果表明,随着该地区土壤含水量的增加,其腐蚀速率基本成线性上升趋势,15%含水量的土壤中阳极的腐蚀速率为5%含水量土壤中的2倍。随着时间的延长,腐蚀产物在阳极表面沉积,经过一定时间会出现块状脱落。AZ63镁阳极在该地区的土壤中腐蚀形貌基本不均匀,而且随着土壤含水量的增加,局部腐蚀严重。在库尔勒地区平均含水量为10%的土壤中,AZ63镁合金牺牲阳极的电流效率达到了63.5%,达到了我国阴极保护的国家标准。
The corrosion behavior of AZ63 Mg-based alloy sacrificial anode in Kuerle area, a key area for the conveyance of natural gas from West China to East China, has been studied using weight loss method and alternating current (AC) impedance measurement, together with scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the corrosion rate of the Mg -based alloy sacrificial anode linearly increased with increasing moisture content in soil, and the corrosion rate in the soil with a moisture content of 15% was twice as much as that in the soil with a moisture content of 5%. Moreover, corrosion products were found to accumulate on the surface of the anode and peeled off at a certain extended lest duration. In general, the corroded surface of the Mg alloy sacrificial anode in this area was dominated by inhomogeneity, and the corrosion became increasingly severe with increasing moisture content in the soil. Fortunately, the Mg alloy sacrificial anode has a current efficiency of 63. 5% in Kuerle the area with an average moisture content of 10% , qualified for the cathodic protection established by relevant national standard.
出处
《材料保护》
CAS
CSCD
北大核心
2008年第4期4-6,9,共4页
Materials Protection
基金
国家科技基础条件平台建设项目(2005DKA-10400)
国家自然基金十五重大项目(50499333)
