equipment and instrument raised taller requirement, complex working condition detection of a function is good or bad, must ensure that the economy under the premise, summed up using a variety of high-tech progress and improvement of metal materials function.

外表工程技能是运用科技手法对资料外表进行处置，通过改动资料外表和 亚外表的成分、微观安排布局以此来改进和进步其功能，满意运用需要。金属零件在运用进程中的损坏往往是从外表开端的，或因触摸介质的化学腐蚀，或高温环境的氧化和熔化，或冲突工况及磨料介质中的磨损，或杂乱受力下的曲折、改变、拉压或剪切。因而，强化外表成为反抗此类损坏的第一道防地。这些年，外表改性处置、外表涂镀\/层技能和堆焊外表改性技能因其不一样的优点在外表工程技能范畴迅速开展。

The appearance of engineering skills is the use of scientific methods to dispose of the material surface, by changing material surface and appearance composition, micro layout to improve and progress of its function, meet the need. Metal parts damaged in use process is often from the beginning of appearance, or because of chemical corrosion touch medium, oxidation and melting or high temperature environment, or conflict conditions and abrasive medium wear, or clutter under the force of the twists and turns, change, tension or shear.