Investigation on the mechanism of laser colorful marking

摘要

Laser marking has been found wide application in many fields. However, laser colorful marking has seldom been used because of its complexity of processing. Recently, the researchers have been attracted on this research for its' huge potential market. Nevertheless, the mechanism of laser colorful marking is still not quite clear. In order to explore essence of laser colorful marking on metal, this paper introduces the mechanism of laser colorful marking on stainless steel and titanium and the mechanism of color generation of film processed by laser colorful marking. The mechanism of laser colorful marking on metal is the optical films which are oxide and nitride coated on the surface of metal, are generated by controlling laser energy input and the approach of scanning region. It was found that the films on surface of stainless steel contain ferric oxides and nitrides and the films on surface of titanium contain titanium oxides and nitrides. The composition of films with different color is different in terms of substance.