Nb微合金化对低合金高强钢耐海水腐蚀性能的影响
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摘要
利用室内模拟海水加速腐蚀试验及电化学分析,研究了Nb微合金化对Cu-Cr-Ni-P系低合金高强钢耐海水腐蚀性能的影响。结果表明,含Nb钢与不含Nb钢组织均由铁素体和珠光体构成,但Nb微合金化后钢中珠光体组织减少且晶粒细化明显,其在模拟海水介质中的平均腐蚀速率与不含Nb钢相比,降低了约12%,阳极腐蚀电流密度也有所降低。由此可见,在Cu-Cr-Ni-P系低合金高强钢中加入Nb元素有助于提高其耐海水腐蚀性能。
By means of indoor accelerated corrosion test and electrochemical analysis,the effects of Nb microalloying on the seawater corrosion resistance of Cu-Cr-Ni-P based high-strength low-alloy steel were investigated.The results show that the microstrucutre of Nb-free steel and Nb-bearing steel are both ferrite and pearlite,but less amount of pearlite and finer grain size are observed in the Nb-bearing steel.Moreover,the average corrosion rate of the steel microalloyed with Nb under the simulated seawater medium is reduced by about 12%compared with the Nb-free steel,along with the reduction of anode corrosion current density.Thus,the addition of Nb element in the Cu-Cr-Ni-P based highstrength low-alloy steel is beneficial to improving the seawater corrosion resistance.
By means of indoor accelerated corrosion test and electrochemical analysis,the effects of Nb microalloying on the seawater corrosion resistance of Cu-Cr-Ni-P based high-strength low-alloy steel were investigated.The results show that the microstrucutre of Nb-free steel and Nb-bearing steel are both ferrite and pearlite,but less amount of pearlite and finer grain size are observed in the Nb-bearing steel.Moreover,the average corrosion rate of the steel microalloyed with Nb under the simulated seawater medium is reduced by about 12%compared with the Nb-free steel,along with the reduction of anode corrosion current density.Thus,the addition of Nb element in the Cu-Cr-Ni-P based highstrength low-alloy steel is beneficial to improving the seawater corrosion resistance.
引文
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[3]刘志桥,张志建,陈刚,等.Nb含量及退火温度对冷轧低合金高强钢力学性能的影响[J].热加工工艺,2017,46(22):225-227.
[4]李钰.钢中氧化物与溶质原子的相互作用及其对铁素体形成的影响[D].武汉:武汉科技大学,2016.
[5]韩孝永.铌、钒、钛在微合金钢中的作用[J].宽厚板,2006,12(1):39-41.
[6]董方,卜凡超,赵晓辉,等.铌对耐候钢耐工业大气腐蚀性能的影响[J].腐蚀与防护,2013,34(12):1098-1102.
[7]Nie W J,Yang S W,Yuan S Q,et al.Dissolving of Nb and Ti carbonitride precipitates in microalloyed steels[J].Journal of University of Science and Technology Beijing,2003,10(5):78-80.
[8]Guo J,Yang S W,Shang C J,et al.Influence of carbon content and microstructure on corrosion behaviour of low alloy steels in a Cl-containing environment[J].Corrosion Science,2009,51(2):242-251.
[9]Dhua S K,Ray A,Sarma D S.Effect of tempering temperatures on the mechanical properties and microstructures of HSLA-100 type copper-bearing steels[J].Materials Science and Engineering A,2001,318(1-2):197-210.
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