针对锈层疏松多孔结构的特点，采用脉冲CO2激光器湿洗清除钢铁表面的锈蚀。通过预喷涂液膜，使液体渗透到锈层内部以改善锈层的热传导和提高材料的平均比热，同时液体自身的受热爆发性气化也会起到破碎锈层的作用，有效提高激光清洗的效率。但是，液体如果有残余会加剧铁的电化学腐蚀，因此必须及时地把残余的液膜去除。使用第二束声光调Q NdYAG激光加热铁基底表面，通过控制激光脉冲个数调控表面的温度，在表面残余的液膜得到有效去除之后，继续加热铁基底表面，以加快铁基底表面的氧化过程，生成致密的氧化铁薄膜，实现均匀钝化，可有效提高清洗后铁质材料的抗腐蚀性。设计了一种双光束激光湿洗装置，能够使清洗、钝化一步完成。

Pulsed CO2 laser is used in the wet laser cleaning of rust from iron surface. By pre-spraying liquid film to the top surface, the liquid can penetrate into the rust layer due to the porous structure of the rust, so the thermal conductance and the mean specific heat of the rust layer can be improved. At the mean time, as the explosive evaporation of the liquid in the rust under laser irradiation has the effect of breaking down the rust layer, the cleaning efficiency can be efficiently increased. But it is disadvantageous that the electro-chemical corrosion of the iron will be intensified if the liquid film has some residue. Thus, the removal of the residual liquid film is a necessary operation after the first-step of cleaning. Acousto-optic Q-switched NdYAG laser is used to heat the iron surface. By adjusting the number of laser pulse, the surface temperature can be controlled. The residual liquid film is vaporized firstly, and then the oxidation process of the superficial iron layer can be accelerated. A dense film of iron oxide is formed above the iron surface. Uniform passivation is realized and the corrosion resistance of the iron is modified after laser cleaning. A device of laser wet cleaning adopting dual laser beam is designed, which can perform cleaning and passivating simultaneously.