Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Pure Al plates were exposed in different atmospheres for 12 months at three typical test sites respectively: i.e. a rural site at Xishuangbanna of Yunnan province, an industrial site at Jiangjin of Sichuan province and a coastal site at Wanning of Hainan province. Then the corroded Al plates were characterized by means of EIS technique and SEM. The results indicate that the corrosion resistance of pure Al is the worst in the coastal atmosphere, the best in the rural atmosphere and the middle in the industrial atmosphere. Different thick layers of corrosion products were formed on Al surface in the rural and industrial atmosphere. In the contrast, a few corrosion products were formed dispersedly in the coastal atmosphere. The rate controlling step may be the diffusion of corrosive ions for the corrosion process in the coastal atmosphere, while the charge transfer for those in the rural and industrial atmospheres.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《中国腐蚀与防护学报》
Abstract： Atmospheric corrosion of carbon steel Q235 and 45#, and weathering steel Corten A was studied in three typical atmospheres at tropic rainforest-, marine- and industrial-exposure sites respectively. Results show that the carbon steels and the weathering steel exhibited more or less the same corrosion kinetics, the formation of rusts and their evolution for exposure in one test site. But they were significant different from those for exposure in other test sites. Finally, the influence factors on corrosion process and the corrosivity of the three atmospheres were also discussed.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： none
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： Effect of NaHSO3 coupled with NaCl on the corrosion of Q235 steel in an alternative dry/wet test environment, which aims to simulate atmosphere corrosion, was investigated by SEM, XRD, FTIR and mass loss analysis. The results show that the synergic effect of NaHSO3 and NaCl plays an important role in the corrosion process of Q235 steel. The mass losses are larger in the test environment with the simultaneous presence of NaHSO3 and NaCl rather than either of the two. The corrosivity of corrosive media could be ranked as follows: NaHSO3+NaCl＞NaHSO3＞NaCl. The presence of NaHSO3 in the test environment could facilitate the formation of corrosion product α-FeOOH, while NaCl could facilitate the formation of γ-Fe2O3 and Fe3O4.
Subjects: Materials Science >> Materials Science (General) submitted time 2017-11-21 Cooperative journals: 《金属学报》
Abstract：本文采用失重分析、X射线衍射分析及扫描电镜测试分析方法对碳钢Q235在模拟海洋工业大气环境中的初期腐蚀历程和机理开展深入研究，并着重探究了不同比例SO2和Cl-的协同效应对碳钢初期腐蚀行为机制的影响。结果表明，碳钢Q235在模拟海洋工业大气环境中的初期腐蚀呈现由加速过程向减速过程转化的特点，且加速过程的腐蚀动力学仍遵循幂函数规律D=Atn；腐蚀24h后，腐蚀产物呈现双层结构,即疏松的外层和相对致密的内层。SO2和Cl-的协同效应会加速碳钢的腐蚀，但二者比例的变化对碳钢腐蚀失重影响并不明显，也没有改变腐蚀产物成分，SO2的存在促使碳钢腐蚀形态由局部腐蚀向均匀腐蚀转变。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-14 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：以 NaCl+NaHSO3为腐蚀介质，通过浸渍干湿复合循环实验及腐蚀失重分析，并利用SEM，XRD和FTIR技术，研究了Q235 碳钢和P265GH 低合金钢的大气腐蚀行为。结果表明，两种钢的腐蚀遵从相同的动力学规律,腐蚀产物中均存在大量致密的FeOOH 和非晶态FeOOH，锈层具有很好的保护性，使得腐蚀速率降低。实验开始阶段两种钢的腐蚀量基本相同，但随着腐蚀的进行两者差距增大，P265GH 低合金钢比 Q235 碳钢的失重小、锈层致密、耐腐蚀性好。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-12 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：通过2年现场大气暴露实验，利用金相显微镜和扫面电子显微镜等手段分析试样表面和截面形貌，研究了U弯受力状态下包铝与无包铝的LY12和LC4两种铝合金在我国西部盐湖大气环境中的腐蚀行为。结果表明，包铝的两种铝合金的腐蚀主要发生在包铝层，以点蚀为主，未观察到包铝层被腐蚀穿透。无包铝的铝合金试样都发生了明显的沿晶应力腐蚀开裂，其中LY12铝合金在拉应力和压应力下都有较多的应力腐蚀裂纹，LC4铝合金只在拉应力下观察到了裂纹；两种铝合金在压应力下都发生了剥层腐蚀，拉应力下受到了抑制。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-11 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：通过循环盐雾腐蚀实验，模拟镀锌钢在酸雨环境中的腐蚀过程。采用腐蚀质量损失测试、扫描电镜(SEM)、X 射线能谱(EDS)和电化学技术分别对腐蚀48h、84h、132h、180h 和228 h的镀锌钢试样进行测试分析，得到腐蚀动力学、腐蚀产物成分、锈层截面形貌以及表面锈层的电化学特性，研究锈层对镀锌钢在酸雨条件下大气腐蚀的影响。动力学分析表明，腐蚀过程中镀锌钢的表面形成了具有较好保护性的锈层；电化学测试结果表明，锈层的保护性呈现随腐蚀时间的延长先增强后减弱的变化过程。
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