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| Corrosion Behavior of Q345q Bridge Steel in Three Simulated Atmospheres |
GUO Tieming1( ),ZHANG Yanwen1,QIN Junshan2,SONG Zhitao1,DONG Jianjun2 |
1. YANG Xinlong2, NAN Xueli1
2. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Corrosion behavior of Q345q bridge steel was studied by dry-wet alternating accelerated corrosion test method with three designed media, which aim to simulate three environmental conditions commonly encountered in the Northwest China, namely deicing-, industrial- and industrial with deicing-conditions respectively. While the corrosion kinetics curves of Q345q bridge steel were measured by weight loss method. The morphology, microstructure and phase composition, as well as the electrochemical properties of the rust scales of Q345q bridge steel corroded for different time were assessed by means of SEM, XRD and electrochemical workstation. Results show that although the corrosion rate is small in the deicing salt medium within 480 h, the corrosion product contains unstable and soluble compounds such as β-FeOOH and chloride, which results in loose rust scale, the corrosion current of the rust scale increases with time, thus which is poor in protectiveness. The corrosion rate in the sodium bisulfite medium is higher, but with the increase of corrosion time, the corrosion rate decreases rapidly, the anode corrosion current of the rust scale decreases, therewith, the rust scale is protective. In the mixed medium, the corrosion behavior is a coupling effect. Due to the existence of corrosion products such as chlorides, the compactness of the rust scale is poor, but which exhibits protectiveness to a certain degree in comparison with that in the deicing salt medium.
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Received: 05 September 2018
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| Fund: Supported by National Natural Science Foundation of China(51461029);Guangdong Sailing Program to Introduce Innovative Entrepreneurial Team of Special Funding(2015YT02G090);Scientific Research Projects of Gansu Transportation Department(2017-16 and 2017-19) |
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Corresponding Authors:
Tieming GUO
E-mail: guotm@lut.cn
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