| CHEN Dong,LI Zhong-sheng,WU Hu-lin,CONG Da-long.Corrosion Resistance of Cold Sprayed Pure Al Coating[J],45(12):174-179 |
| Corrosion Resistance of Cold Sprayed Pure Al Coating |
| Received:February 23, 2016 Revised:December 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.12.028 |
| KeyWord:cold spraying pure Al coating salt spray corrosion resistance electrochemical corrosion microstructure corrosion morphology |
| Author | Institution |
| CHEN Dong |
Chengdu Military Representative Office, Military Representative Bureau of Army Aviation, Chengdu , China |
| LI Zhong-sheng |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| WU Hu-lin |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| CONG Da-long |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| The work aims to provide theoretical basis for applications of cold spraying technology in marine atmosphere anticorrosion by studying corrosion resistance of cold sprayed pure Al coating to neutral salt spray. Pure Al coating was prepared on 30CrMnSiA substrate by taking advantage of cold spraying technology. The corrosion resistance and the influence factors of cold sprayed coating samples were studied by means of such techniques as metallographic structure analysis, XRD diffraction analysis, electrochemical corrosion test and neutral salt spray test. Cold sprayed coating was very compact, its compactness increased continuously as the spraying temperature and pressure improved. Provided with the process conditions of 500 ℃ (spraying temperature), 1.2 MPa (spraying pressure of N2), 25 mm (spraying distance) and nitrogen as working gas, the porosity of pure Al coating was 0.5 % and no oxide was present in the coating, hence the coating could isolate corrosive medium from substrate effectively. The corrosion rate of pure Al coating was 4.935×10-7 A/cm2. The coating provided electrochemical corrosion protection for the subsdtrate as anode. The pure Al coating was not subject to corrosion reaction in neutral salt spray test for 1440 h. Corrosion morphology analysis indicated that cold sprayed pure Al coating showed excellent corrosion resistance under the protection of surface passivation film and sealing process of corrosion products. Though slight corrosion occurred, the corrosion rate was low and surface quality was good, the cold sprayed Al coating could be a long-acting anticorrosive coating. Cold sprayed pure Al coating shows excellent corrosion resistance and can provide a long-acting effective corrosion protection for steels. |
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