Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： The corrosion characteristics of reinforced steel in simulated concrete pore solutions with different amount of chloride ion and sulfate ion were investigated by means of polarization curves and electrochemical impedance spectroscopy. The results show that the corrosion rate of reinforced steel rose firstly and then declined with the increasing SO42- concentration in the solutions. The corrosion rate of the reinforced steel was the highest in a simulated sub-chloride saline soil solution (m(Cl-) / m(SO42-)=1.5). This suggested that addition of certain amount of SO42- can enhance the corrosion of reinforced steel. The corrosion rate of reinforced steel decreased gradually with the proportionally increasing amount of SO42- and Cl- in the solutions, which may be ascribed to the formation of a thick salt film on the steel surface and thereby lead to the increase of diffusion resistance for cathode process.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： The corrosion behavior of 2A12-T4 Al-alloy in salt-spray environment was studied by means of mass loss method, electrochemical test, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the relationship between the corrosion induced mass loss and corrosion time was in accordance with power rule. At the initial corrosion stage, pitting corrosion occurred under the action of Cl-, then pitting corrosion turned to be overall corrosion, and the scale of corrosion products composed of Al(OH)3 was loose and thickened with time. During the middle and later corrosion stages, the outer portion of corrosion product spalled off, while the residual portion of corrosion product scale became compact. With the increasing corrosion time, Icorr decreased firstly, then increased and finally decreased again. In the meantime, capacitive reactance arc shrunk firstly, then expanded, and finally shrunk slightly.
Subjects: Geosciences >> Marine Sciences Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract：采用失重分析、极化曲线测试和SEM分析手段，研究了模拟海洋大气环境下直流电场对碳钢初期腐蚀行为的影响。结果表明，直流电场的存在加速了碳钢的初期腐蚀速率，但并没有改变其腐蚀动力学；直流电场存在有利于具有亚稳片状结构的γ-FeOOH的形成，同时抑制了γ-FeOOH向具有保护性能的α-FeOOH的转化，从而导致锈层的保护性能下降，加速了碳钢的腐蚀。
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