采用Gleeble--1500热模拟试验机模拟了22SiMn2TiB超高强度钢焊接 接头热影响区的组织, 并利用Solaron SL1280B恒电位仪测定了热模 拟HAZ各区在3.5\%NaCl水溶液中的极化行为, 建立了热模拟组织与其 在3.5%NaCl水溶液中腐蚀行为的关系. 结果表明: 22SiMn2TiB超高 强度钢显微组织转变受碳和硼的扩散、偏聚和碳化物的脱溶所控制, 且依赖于最高加热温度θmax和冷却时间t8/5. 虽然热模拟组织发生了变化,但热模拟HAZ各区在3.5%NaCl水溶液中 的极化曲线的形状和趋势大致相同, 组织变化对自腐蚀电位有一定的 影响, 但影响幅度不大. 自腐蚀电位与腐蚀电流之间无对应关系; 腐 蚀电流的大小由氧的极限扩散电流决定. 在电偶腐蚀过程中, 焊接熔合区作为阳极而溶解, 需重点防护
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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