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| HAZ Corrosion of 22SiMn2TiB Ultra-Strength Steel Weldment in 3.5%NaCl Solution |
| TAN Wei(TAN Way); XU Binshi; HAN Wenzheng; FENG Shaowu; FENG Jianlin; ZHONG Qunpeng |
| School of Materials Science and Engineering; Beijing University of Aeronautics & Astronautics; Beijing 100083 |
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Cite this article:
TAN WeiTAN Way; XU Binshi; HAN Wenzheng; FENG Shaowu; FENG Jianlin; ZHONG Qunpeng. HAZ Corrosion of 22SiMn2TiB Ultra-Strength Steel Weldment in 3.5%NaCl Solution. Acta Metall Sin, 2004, 40(2): 197-201 .
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Abstract Weld heat affected zone (HAZ) microstructures of 22SiMn2TiB
ultra-strength steel were thermally simulated by means of
Gleeble-1500 machine. Polarization measurement of the quenched
zone and tempered zone in 3.5%NaCl solution was conducted
respectively with potentionstat/galvanostat Solaron SL1280B.
The relation between the microstructure and the HAZ corrosion
resistance in 3.5%NaCl solution was established. Carbon and
boron diffusions, segregation and iron carbide or boride
precipitation are dependent on simulated weld thermal cycle peak
temperature θmax and continuous cooling time t8/5,
and induce the microstructure transformation. The polarization
curves and corrosion potentials of the simulated HAZ with different
microstructures in 3.5%NaCl aqueous solution are slightly different;
the limit diffusion current of dissolved oxygen in 3.5%NaCl
solution decides corrosion current. Weld bond, which undergoes anodic
dissolution in couple corroding, needs to be protected carefully.
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Received: 15 April 2003
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