| METALS AND METAL MATRIX COMPOSITES |
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| The Influence of Solution pH and Temperature on the Non-uniform Corrosion of X65 Pipeline Weldment |
| ZHU Yesen1,2, LIU Liang1, XU Yunze1, WANG Xiaona3, LIU Gang1, HUANG Yi1
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1 School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
2 Power China Huadong Engineering Corporation Limited, Hangzhou 311122, China
3 School of Physic and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China |
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Abstract In this work, the non-uninform corrosion behaviors of X65 pipeline weldments in the saturated CO2 solutions of different solution pH and temperature were studied using a multi-ring array corrosion monitoring sensor . The result shows that both the non-uniform corrosion of the pipeline weldment with the 360° full circumference and along the pipe-length axis could be effectively monitored. Combining the electrochemical test and corrosion morphology characterization, it can be seen that when the pH of the solution was 5.85, the protective corrosion product film was difficult to form on the surface, CO2 corrosion of all three welding areas (base metal, heat affected zone and welding metal) aggravated with the increase of temperature, and the corrosion of the welding metal was the most severe. When the pH of the solution was 6.86, the protective corrosion product layer would form on all three welding areas which could slow down the corrosion rate with the increase of temperature. Due to the enrichment of widmanstatten ferrite and acicular ferrite in the welding metal, the film formation time of the welding metal would lag behind the base metal and the heat affected zone.
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Published: 13 January 2022
Online: 2022-01-13
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| Fund:This work was financially supported by the Fundamental Research Funds for the Central Universities (DUT21RC(3)093) and the National Natural Science Foundation of China (52001055). |
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2022, Vol. 36 
