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| Corrosion Property at Marine Atmosphere of Al Based Coatings Replacing Cd on High Strength Steels |
| Received:June 26, 2017 Revised:December 15, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2017.12.014 |
| KeyWord:high strength steels marine atmosphere replacing Cd Al based coatings |
| Author | Institution |
| SUN Zhi-hua |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| LIU Ming |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHANG Xiao-yun |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| LU Feng |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| TANG Zhi-hui |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHAN Zhong-wei |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
| ZHANG Qi |
Aviation Key Laboratory of Science and Technology on advanced Corrosion and Protection for Aviation Material, Beijing Institute of Aeronautical Materials, Beijing , China |
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| Abstract: |
| Objective To evaluate the corrosion property at marine atmosphere of three kinds of protective coatings on high strength steels, including electroplating Cd-Ti ( Ed Cd-Ti), ion vapour depositing aluminium (IVD Al) and electroplating Aluminium( Ed Al). Methods Neutral salt fog test, marine atmospheric outdoor exposure test, macroscopic and microscopic observation of the three coatings before and after corrosion tests were carried out to observe macroscopic and microscopic morphology of coating and analyze components of corrosion products. Results White corrosion products on IVD Al and Ed Al coatings appeared after 96h and 336h of test, and red corrosion products appeared after 336h and 500h of test, but there was no corrosion product after 1000h of test on Ed Cd coatings. The marine atmospheric outdoor exposure tests results showed that there were white corrosion pits on IVD Al and Ed Al after half a year test, and red corrosion pits appeared after one year of exposure test, and corrosion occurred to the cross-section after one year of test. While only little corrosion product appeared on cross-section after one year of exposure test on electroplating Cd-Ti. Both the two coatings were likely to suffer from corrosive pitting on aluminized coating. The corrosive pitting went deeper as time went by. Red rust appeared on the matrix of corrosion. Conclusion The anti-corrosion property of IVD Al and Ed Al are inferior to that of Ed Cd. Cd coating can provide anodic sacrificed effect on the steel substrate while the IVD Al and Ed Al has less sacrificed effect. |
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