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 2016-11-12 Cooperative journals: 《中国腐蚀与防护学报》
Abstract:通过实海暴露实验,研究了N6纯镍和Monel400镍合金在中国南海海域800米和1200米深海环境下的长周期(3年)腐蚀行为。采用SEM,EDS和XRD技术,分别进行了腐蚀形貌观察,腐蚀产物成分和相组成分析。结果表明:在深海环境下,Monel400镍合金的耐局部腐蚀能力要优于N6纯镍。N6纯镍在绿色腐蚀产物膜(由NiCl2?6H2O组成,还覆盖有少量的CaCO3、MgCO3等无机盐类)下面发生了很严重的隧道腐蚀,甚至出现了局部穿孔现象。Monel400镍合金表面生成了宽浅型的点蚀坑,点蚀坑上覆盖有由(CuNi)2Cl(OH)3组成的腐蚀产物。将本文中的实验结果与文献中同种合金的实验结果对比作图,表明N6纯镍和Monel400镍合金的最大点蚀坑深度均随水深的增加而降低。
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:根据304不锈钢材料在西沙地区典型的热带海洋大气腐蚀的特点,在当量计算的基础上,发展了一种模拟西沙室外大气环境的室内加速腐蚀方法,且从腐蚀动力学特征、腐蚀机理、腐蚀产物等几个方面探讨了304不锈钢材料在我国典型热带海洋地区大气暴露试验结果和室内加速腐蚀试验结果的相关性。研究结果表明,紫外/周期浸润复合加速腐蚀试验一定程度上能较好的模拟304不锈钢材料在西沙海洋大气环境中的腐蚀行为,通过这个加速腐蚀试验可以针对304不锈钢材料在该地区的大气腐蚀行为进行一定程度的预测。
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。
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-04 Cooperative journals: 《金属学报》
Abstract:采用电化学阻抗谱(EIS)和扫描Kelvin探针技术(SKP)研究了热风整平无铅喷锡处理印制电路板(PCB-HASL)在模拟电解质0.1 mol/L NaHSO3以及不同pH值的0.1 mol/L NaHSO3/Na2SO3溶液中的腐蚀行为与机理,探讨了浸泡时间和pH值对其腐蚀机理转变的影响,通过OM, SEM结合EDS对PCB-HASL表面上腐蚀产物形核和扩展行为进行了观察和分析。结果表明:PCB-HASL试样在酸性NaHSO3/Na2SO3溶液体系中的腐蚀形式类似点蚀,浸泡前期腐蚀坑加速扩展,腐蚀产物主要为Sn的氧化物和硫酸盐。NaHSO3溶液能够活化PCB-HASL试样表面,且腐蚀坑形核仅发生在浸泡初期。而在中性或碱性NaHSO3/Na2SO3溶液体系中,PCB-HASL试样表面腐蚀坑形成受到抑制,电解质溶液通过氧化膜向电极界面的传输过程限制了电极反应速率。