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| Compatibility and Recoatability of In-service Coatings for Steel Structures |
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| DOI：10.7643/issn.1672-9242.2022.11.017 |
| KeyWord:in-service coating compatibility recoatability top coat reapplied coating system adhesion |
| Author | Institution |
| WANG Hong-lun |
Xichang Satellite Launch Center, Sichuan Xichang , China |
| ZHANG Dong-jiu |
Xichang Satellite Launch Center, Sichuan Xichang , China |
| YANG Hua |
Xichang Satellite Launch Center, Sichuan Xichang , China |
| TU Qi-yong |
Xichang Satellite Launch Center, Sichuan Xichang , China |
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| Abstract: |
| In view of the phenomenon of the surface coating of a large-scale steel structure facility near the sea, such as powder, loss of light and discoloration, the compatibility and repainting ability of several top coatings after the ageing of the in-service coating for steel structure were studied. The finishing paint repainting test was carried out to complete the test of coating system compatibility and repainting performance, and to evaluate the performance of in-service coating after repainting.First, several typical in-service protective coating systems for steel structures are sanded off the aged topcoat as the initial coating (coating A). Then, the top coat B, which performed well in the accelerated test of cyclic salt spray and xenon lamp, was chosen as coating B. A new coating system was prepared by coating B on coating A. Finally, the test of coating compatibility and recoating property is completed, and the test results of adhesion, indentation length and cupping of 30 coating combinations are analyzed. After repainting, the tensile adhesion of all the samples was more than 5 MPa, and the indentation length of re-coating was decreased in 9 of 30 groups (30%) , most of the cupping test values were 1.5~4.5 mm. The coating system can meet the general requirements of coating protective coating adhesion, anti-indentation performance has been improved, the ductility is better after repainting. In the evaluation of coating recoatability and compatibility, the adhesive force should be considered to meet the application requirements, and the adhesive force of the coating system should be improved, and the hardness and ductility should be considered next. |
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