3%NaCl水溶液におけるAl-Zn-Mg合金の粒界域のアノード分極挙動と応力腐食による時効脆化について

DOI Web Site Web Site

書誌事項

タイトル別名
  • Anodic Polarization at the Grain Boundary Region and Aging Embrittlement by Stress-Corrosion in Al-Zn-Mg Alloys in 3%NaCl Aqueous Solution
  • 3パーセント NaCl スイヨウエキ ニ オケル Al Zn Mg ゴウキン

この論文をさがす

説明

Anodic polarization behaviors at the local region near a grain boundary groove of Al-Zn-Mg alloys in 3%NaCl aqueous solution containing K2Cr2O7, and the relation between stress-corrosion (SC) and hydrogen were discussed. The break-down potential was shifted to the noble side by soluble oxygen in the electrolyte, and the potential in the grain boundary groove became more noble than that on the grain, and the break-down potential was shifted to the less noble side by the applied stress. Anodic polarization in the grain boundary perpendicular to the applied stress deteriorated in reproducibility with increasing stress. The tensile strength of the specimens subjected to the SC treatment (147.1 MPa, 3.6 ks, 3%NaCl+5 kg/m3 K2Cr2O7 at 323 K) were measured as tensile strength at intervals of 0 s, 86.4 ks, 172.8 ks and 1.728 Ms. The tensile strength decreased up to 172.8 ks, but gradually recovered to the previous strength at 1.728 Ms. Thus, this will be inferred from absorption, diffusion and release of hydrogen gas in the specimen. Tensile fracture surfaces are observed by scanning electron microscopy. Specimens which were not treated with SC generated chemically reactive micro-cracks at the intergranular, but in the SC treatment, cracks initiated at the edges of three adjacent grains, and the former fracture surface showed intergranular cracking, but the latter showed a both intergranular cracking and transgranular cracking.

収録刊行物

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ