Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： The corrosion behavior of pure aluminum A1060 in tropic marine environment was simulated by cyclic immersion test, while the correlation of the corresponding results of indoor cyclic immersion test and outdoor marine atmospheric corrosion test of A1060 was comparatively studied in terms of its corrosion morphology, corrosion products and corrosion kinetics by means of weight loss measurement scanning, electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The results showed that the corrosion morphologies and phase constituents compositions of corrosion products after cyclic immersion test agreed fairly well with those after the real atmospheric test. Thereafter, a prediction model for the C corrosion prediction model of aluminum 1060 in two kinds of marine atmospheric environments, which aims to simulate the atmospheric environments at Wanning and Xisha areas in the South China Sea, was estab-lished built combined with Grey correlation method, while the corresponding arithmetic expressions could be described as follows i.e. TWN=146.7t 1.29 and TXS=862.3t 0.85 respectively.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： The effect of alloyed Cr on the corrosion behavior of a corrosion-resistant rebar 5Cr steel in simulated concrete pore solutions (saturated Ca(OH)2 solution) with various Cl- contents was investigated. The results showed that the corrosion resistance of 5Cr steel is much better than HRB400 steel, and which may be attributed to the following reasons: the addition of 5%Cr enabled the microstructure of the steel to be refined as bainites dispersed uniformly on ferrites; the passive film formed on 5Cr steel to be modified to exhibita nobler pitting potential in simulated concrete pore solution and to possess a higher content of α-FeOOH in the rust scales, which all lead to the corrosion resistance of 5Cr steel superior to HRB400 steel.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： Corrosion behavior of the Cr modified HRB400 carbon steel rebar in 2%NaCl solution was investigated by means of dry/wet cyclic corrosion test, potentiodynamic polarization and electrochemical impedance spectroscopy. Results show that the open circuit potential moved to higher value in positive direction; the corrosion current density decreased; the polarization resistance increased and the corrosion rate declined for the Cr modified steel in comparison to HRB400 steel. After dry/wet cyclic corrosion test for 72 h, the HRB400 steel exhibited an uniform corrosion morphology, however the Cr modified steel rebar exhibited features of local corrosion. Anyhow, the addition of Cr can significantly reduce the uniform corrosion rate of HRB400 steel rebar.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-07 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：本文采用电化学极化曲线和交流阻抗技术对2205双相不锈钢在0.1%、1.0%及3.5%三种不同浓度的NaCl溶液进行测试，采用PDM点缺陷模型对测试结果进行建模与分析。从分析结果得知材料随着溶液浓度的升高抗点蚀能力下降，这是由于在钝化膜的生长过程中，氧离子缺陷产生于金属/膜界面，消耗于膜/溶液界面，而金属离子缺陷产生于膜/溶液界面，消耗于金属/膜界面；氧离子缺陷的迁移导致钝化膜的生长，而金属离子缺陷的迁移使得钝化膜发生溶解。另外，根据PDM模型理论并从金属相角度出发对2205不锈钢建立钝化膜溶解模型，可知2205双相不锈钢奥氏体相γ上的钝化膜可能比铁素体相α优先发生溶解。
Subjects: Materials Science >> Materials Science (General) Subjects: Geosciences >> Marine Sciences submitted time 2016-11-07 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：摘 要：采用周浸试验模拟了纯铝A1060在我国万宁、西沙两种海洋大气环境的腐蚀行为，用扫描电镜(SEM)、能谱(EDS)、X射线衍射（XRD）、失重法等方法对比了A1060纯铝在室内模拟大气环境和户外实际大气环境中的腐蚀形貌、腐蚀产物、腐蚀动力学之间的相关性。试验结果表明，周浸试验后A1060的腐蚀形貌、腐蚀产物组成、腐蚀动力学规律与实际热带海洋大气环境暴露试验结果相关性较好。结合灰关联法建立了A1060在两种海洋大气环境下的腐蚀寿命预测模型：T_wn=146.7t^1.29，T_xs=862.3t^0.85。
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