| LI Hang,LI Xinmei,YANG Xianchen,ZHANG Zejiang,YANG Dingli.Corrosion Behavior and Mechanical Properties of Transmission Line Tower Materials in Marine Industrial Atmosphere[J],54(2):87-95 |
| Corrosion Behavior and Mechanical Properties of Transmission Line Tower Materials in Marine Industrial Atmosphere |
| Received:February 25, 2024 Revised:July 18, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.02.006 |
| KeyWord:marine industrial atmosphere transmission lines low alloy steel corrosion behavior rust layer evolution mechanical property |
| Author | Institution |
| LI Hang |
College of Materials Science and Engineering,College of Intelligent Manufacturing and Modern Industry College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| LI Xinmei |
College of Materials Science and Engineering,College of Intelligent Manufacturing and Modern Industry College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| YANG Xianchen |
College of Materials Science and Engineering,College of Intelligent Manufacturing and Modern Industry College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| ZHANG Zejiang |
College of Materials Science and Engineering,College of Intelligent Manufacturing and Modern Industry College of Mechanical Engineering, Xinjiang University, Urumqi , China |
| YANG Dingli |
College of Materials Science and Engineering,College of Intelligent Manufacturing and Modern Industry College of Mechanical Engineering, Xinjiang University, Urumqi , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The marine industrial atmospheric environment formed by industrial pollution in coastal areas is harsher and more complex than the general atmospheric environment. This paper aims to study the corrosion kinetics, rust layer evolution and mechanical property degradation of Q345 steel and SQ420NH steel used for transmission towers under simulated marine industrial atmospheric environments. The differences of corrosion rules between two kinds of low alloy steels were discussed. The dry/wet alternating cycle salt spray corrosion test was adopted to simulate the marine industrial atmospheric environment. The design of the dry/wet alternating salt spray test method better reproduced the corrosion process of steel under the real atmospheric environment. By means of scanning electron microscope, X-ray diffractometer, electrochemical test and electronic universal testing machine, the accelerated corrosion behavior, corrosion mechanism and mechanical property degradation of low alloy steel were analyzed and summarized. The results showed that the corrosion kinetics of the two kinds of low alloy steels conformed to the power function law, and the corrosion depth of Q345 steel and SQ420NH steel was close at the initial corrosion stage. As the corrosion continued, the corrosion depth of SQ420NH steel was significantly lower than that of Q345 steel. The rust layer formed by low alloy steel had a certain protective effect on the substrate, and the protective effect of SQ420NH steel was better than that of Q345 steel. The surface rust layer of Q345 steel was loose and porous, accompanied by holes and cracks in the middle stage of corrosion, while the surface rust layer of SQ420NH steel in the middle and late stage was relatively uniform and dense. The content of Cl and S elements on the surface of Q345 steel was higher than that of SQ420NH steel, indicating that Q345 steel had strong adsorption effect on corrosive media. The corrosion products of the two low alloy steels were mainly α-FeOOH, β-FeOOH, γ-FeOOH, Fe3O4/γ-Fe2O3. The relative content of each corrosion product varied with the corrosion period, but the corrosion period had no significant effect on the phase composition of the rust layer. The self-corrosion potential of the two low alloy steels was positive with the corrosion period, and the accumulation of surface rust layer had a certain inhibition effect on the corrosion process. With the extension of corrosion period, the rust layer of Q345 steel and SQ420NH steel was continuously thickened, which caused the strength and shape of low alloy steel tower to decline. It was speculated that the strength degradation of low alloy steel was negatively correlated with the accumulated thickness of rust layer. Corrosion accelerated the crack propagation stage and causes random fracture. In conclusion, the acceleration effect of dry/wet alternating cycle salt spray corrosion test is obvious. Through the analysis of corrosion dynamics, surface rust layer morphology and composition, and mechanical properties, the corrosion rule and corrosion mechanism of low alloy steel can be comprehensively characterized, thus providing certain references for the anti-corrosion design and maintenance of transmission towers in marine industrial atmospheric environment. |
| Close |
|
|
|