Therefore, strengthening the appearance to become the first defense line against such damage. These years, surface modification, surface coating and disposal skill and welding surface modification skills because of their different advantages in the appearance of the rapid development of Engineering skills.

外表改性技能包含以喷丸强化、辊压强化为代表的外表强化技能，以各种氧化、钝化成膜的化学转化膜技能，化学气相堆积技能（CVD）与等离子束、激光束等高能束的外表处置技能。外表改性技能是凭借外在介质改进资料的外表功能，不对原资料增加任何化学元素，改性后的资料外表不存在化学元素的增减，仅仅成分的份额和安排布局发生变化。因而，该技能相对于涂镀（层）技能和堆焊外表改性技能要技能简略，只需操控好进程参数即可。不一样的工况环境对资料的需要也不一样，应根据详细的实践需要挑选处置技能。

Surface modification skills include rolling strengthening shot peening, represented by the appearance of strengthening skill, chemical oxidation, passivation film conversion film skill, chemical vapor deposition (CVD) technique and surface treatment technology of plasma beam, laser beam and high beam. Surface modification with external medium skill is improving appearance, not add any chemical raw materials, the modified material surface does not exist or chemical elements, only