| LI Xue-han,LI Jia-le,QIN Zhen-bo,WU Zhong,HU Wen-bin.Research Progress of Cavitation Corrosion Resistant Coatings[J],51(1):1-15, 42 |
| Research Progress of Cavitation Corrosion Resistant Coatings |
| Received:December 02, 2021 Revised:January 13, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.01.001 |
| KeyWord:cavitation corrosion coatings high hardness coating surface modification layer high elasticity coating |
| Author | Institution |
| LI Xue-han |
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin , China |
| LI Jia-le |
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin , China |
| QIN Zhen-bo |
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin , China |
| WU Zhong |
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin , China |
| HU Wen-bin |
Tianjin Key Laboratory of Composite and Functional Materials, School of Material Science and Engineering, Tianjin University, Tianjin , China |
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| Abstract: |
| In the process of high-speed rotation, propeller, water turbine and pumps are damaged by cavitation corrosion, which will lead to premature failure and result in safety accidents. Cavitation corrosion refers to the destruction of workpiece surface caused by bubble collapse. When the local pressure of the liquid drops, it will cause the nucleation and growth of bubbles. As the bubble flows to the high-pressure region, it collapses and produces micro-jet and shock wave, resulting in the deformation and mass loss of the adjacent workpiece consequently. At present, it is an economical and effective method to reduce cavitation damage by preparing anti-cavitation coatings on the surface of flowing parts. This paper summarized a variety of coating materials used for cavitation protection, which was divided into two kinds according to the principle of cavitation resistance:one is the high hardness coating, which resists cavitation impact with high mechanical strength, such as most of the metal materials, ceramic materials and surface hardening treatment. In this field，metal materials coating and surface hardening treatment are widely used in cavitation resistance, but the aggravation of cavitation by corrosion of metal still needs to be solved. As for cermet coating, particles under thermal spraying process are difficult to melt completely, resulting in a high porosity of the coating, and the ceramic particles are easy to peel off under cavitation erosion, due to the poor binding force. Improving the hardness and toughness of cermet coating and enhancing the bonding force between the coating and substrate, as well as reducing the porosity of coatings, is the research focus and direction in the future. The other is the high elasticity coating with good toughness and plasticity, which can prolong the incubation period of cavitation and absorb shock wave and microjet. Furthermore, cavitation damage can be reduced. Such coatings include shape memory alloy and polymer organic materials coatings. Among them, organic coating is the development trend of anti-cavitation coating in the future, because it can reduce the effect of corrosion significantly. However, the organic coating has poor abrasion resistance and low binding force with metal matrix. It is easy to fall off under the frequent impact of periodic alternating cavitation mechanical force, which has become a major obstacle to the application of this coating. Therefore, the research and development of organic coating is mainly to improve the binding force with the matrix on the basis at the present In this paper, the characteristics, performance, application status and damage mechanism of each corrosion resistant coating in recent years were illustrated, and their advantages and disadvantages were analyzed in detail Finally, the development trend of corrosion resistant coating was prospected. It is pointed out that the metal coating with high strength and toughness is still the main method for cavitation corrosion protection in practical engineering at present. And the organic coating with high elasticity is the direction of coating research and development in the future. In addition, how to improve the binding force between organic coating and substrate should be considered. |
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