天津大学学报(英文版)
天津大學學報(英文版)
천진대학학보(영문판)
TRANSACTIONS OF TIANJIN UNIVERSITY
2014年
1期
54-59
,共6页
程方杰%赵海微%王颖%肖兵%姚俊峰
程方傑%趙海微%王穎%肖兵%姚俊峰
정방걸%조해미%왕영%초병%요준봉
aluminum alloy%oxide film%phase structure%X-ray photoelectron spectroscopy%medium-temperature brazing
The evolution of the surface oxide film along the depth direction of typical aluminum alloy under medium-temperature brazing was investigated by means of X-ray photoelectron spectroscopy (XPS). For the alloy with Mg content below 2.0wt%, whether under cold rolling condition or during medium-temperature brazing process, the en-richment of Mg element on the surface was not detected and the oxide film was pure Al2O3. However, the oxide film grew obviously during medium-temperature brazing process, and the thickness was about 80 nm. For the alloy with Mg content above 2.0wt%, under cold rolling condition, the original surface oxide film was pure Al2O3. However, the Mg element was significantly enriched on the outermost surface during medium-temperature brazing process, and MgO-based oxide film mixed with small amount of MgAl2O4 was formed with a thickness of about 130 nm. The alloy-ing elements of Mn and Si were not enriched on the surface neither under cold rolling condition nor during medium-temperature brazing process for all the selected aluminum alloy, and the surface oxide film was similar to that of pure aluminum, which was almost entire Al2O3.