Effect of Dispersion Particles and Precipitates on the Corrosion Properties of ODS-Cu, Cu-Cr-Zr and Cu-Cr Alloys in Na2SO4 Solutions
Effect of Dispersion Particles and Precipitates on the Corrosion Properties of ODS-Cu, Cu-Cr-Zr and Cu-Cr Alloys in Na2SO4 Solutions
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DOI：
10.1016/j.nme.2022.101159
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发表时间：
2022-03
影响因子：
2.6
通讯作者：
M. Hatakeyama;K. Okada;S. Sunada;Koichi Sato
中科院分区：
文献类型：
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作者：
M. Hatakeyama;K. Okada;S. Sunada;Koichi Sato
由于Cu-Cr-Zr合金具有高强度、高电导率和上级抗中子辐照能力，建议将其作为ITER各部件（包层第一壁、偏滤器、电带等）的热沉材料。ODS-Cu（氧化物分散强化铜）也被选为候选材料。氧化铝分散铜合金（GlidCop® CuAl 15、CuAl 25）在0.1 M和0.01 M硫酸钠（Na 2SO 4）溶液中通过电化学方法评估的腐蚀性能。在0.1 M Na 2SO 4溶液中的开路电位（OCP）测量中，所有合金的电位在浸泡后立即下降，然后逐渐下降。CuAl 15在OCP测试中表现出良好的耐腐蚀性，电位降很小。在极化曲线测量中，对于阴极区域中的每种材料观察到差异。CuAl 25和Cu-Cr-Zr的腐蚀电流密度趋于较高，腐蚀电位也较低。在这些合金中，极化曲线测量后的表面观察显示Cu 2 O钝化膜的厚度变化，并且存在大面积的被认为是薄的膜。在Cu-Cr-Zr中，粗大的柱状Cr沉淀物和Zr在沉淀物/基体界面处的偏析被认为劣化耐腐蚀性。在CuAl 25的情况下，有人建议，由于氧化铝颗粒的体积分数大，钝化膜的溶解增强。
Precipitation-hardened Cu-Cr-Zr alloy is proposed as a heat sink material for various components of the ITER (blanket first wall, divertor, electrical straps and others) owing to its high strength, high conductivity and superior resistance against neutron irradiation. ODS-Cu (Oxide Dispersion Strengthened Copper) is also selected as a candidate material. Corrosion properties of alumina-dispersed copper alloys (GlidCop® CuAl15, CuAl25), aevaluated by electrochemical methods in 0.1 M and 0.01 M sodium sulfate (Na2SO4) solutions. In open circuit potential (OCP) measurement in 0.1 M Na2SO4solution, the potential of all alloys decreased immediately after immersion and then gradually decreased. CuAl15 showed good corrosion resistance in the OCP measurement with little potential drop. In the polarization curve measurements, a difference was observed for each material in the cathode region. The corrosion current densities tended to be higher for CuAl25 and Cu-Cr-Zr, and the corrosion potential was also low in both solutions. In these alloys, the surface observation after the polarization curve measurements showed variations in the thickness of the Cu2O passivation film, and there were large areas where the film was thought to be thin. In Cu-Cr-Zr, coarse columnar Cr precipitates and segregation of Zr at the precipitate/matrix interface are thought to deteriorate corrosion resistance. In the case of CuAl25, it is suggested that dissolution of the passivation film is enhanced due to large volume fraction of alumina particles.