Microstructure and corrosion resistance of Ti-Ni/steel composite materials

Abstract

Steel materials are inevitably corroded by the atmosphere, impurities or liquids, when they are widely applied to machinery, oil pipelines and so on [1][2][3][4] . One study found that the fatigue life of steel wire was decreased by about 99% if there was a tiny corrosion pit with a size of 0.2-0.6 mm, accompanied by an extremely serious damage consequence [5] . Therefore, ways to improve the corrosion resistance of steel materials at the minimum cost has been of concern. An important way to improve corrosion resistance is to avoid chemical reactions between the steel materials and the medium, especially to prevent Fe from forming galvanic cells with other elements in the steel [6][7][8][9][10] .Some corrosion-resistant elements were added during melting to change the structure of the steel materials