Recently, in Japan, Al-5Mg alloy thermal spray coating was applied as a repair method to improve the anti-corrosion performance of painted steel bridges in a highly corrosive environment with chloride in various aspects such as girder ends, bearing supports, and bolted joints. However, the deterioration behavior of the overlapped layer between Al- 5Mg alloy thermal spray coating and heavy-duty paint coating in an atmospheric environment was not clarified in previous studies. In this study, atmospheric exposure tests were performed in highly corrosive atmospheric environments with and without the influence of rainfall washing-off on adhered airborne sea salt to examine the deterioration and anti-corrosion behavior. The exposure sites are located near the coastline. The test specimens were common carbon steel plates with an overlapped layer between the Al-5Mg alloy thermal spray coating and heavy-duty paint coating. To evaluate the effective area of the sacrificial anode reaction by thermal spray coating, a ribbon defect with a width of 12 mm was introduced in the overlapped layer. From the test results, the overlapped layer was deteriorated from the lower part of the thermal spray coating along with the defects in a corrosive environment without the effect of rainfall washing-off. The deterioration of the thermal spray coating layer was accelerated by the sealing treatment of the thermal spray coating layer.
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26 November 2020
FRACTURE AND DAMAGE MECHANICS: Theory, Simulation and Experiment
15–17 September 2020
Mallorca, Spain
Research Article|
November 26 2020
Deterioration and anti-corrosion behaviors of overlapped layer between Al-5mg alloy thermal spray coating and heavy-duty paint coating in highly corrosive atmospheric environment
Shigenobu Kainuma;
Shigenobu Kainuma
a)
1
Department of Civil Engineering, Kyushu University
, JAPAN
a)Corresponding author: [email protected]
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Muye Yang;
Muye Yang
b)
1
Department of Civil Engineering, Kyushu University
, JAPAN
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Haoxuan Yang;
Haoxuan Yang
c)
1
Department of Civil Engineering, Kyushu University
, JAPAN
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Kazuyoshi Muto;
Kazuyoshi Muto
d)
2
Technical Development Division, Fujigiken Co., Ltd.
, Osaka, JAPAN
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Hirokazu Miyata
Hirokazu Miyata
e)
3
West Nippon Expressway Company Limited
, Kansai Branch, Osaka, JAPAN
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Shigenobu Kainuma
1,a)
Muye Yang
1,b)
Haoxuan Yang
1,c)
Kazuyoshi Muto
2,d)
Hirokazu Miyata
3,e)
1
Department of Civil Engineering, Kyushu University
, JAPAN
2
Technical Development Division, Fujigiken Co., Ltd.
, Osaka, JAPAN
3
West Nippon Expressway Company Limited
, Kansai Branch, Osaka, JAPAN
a)Corresponding author: [email protected]
AIP Conf. Proc. 2309, 020048 (2020)
Citation
Shigenobu Kainuma, Muye Yang, Haoxuan Yang, Kazuyoshi Muto, Hirokazu Miyata; Deterioration and anti-corrosion behaviors of overlapped layer between Al-5mg alloy thermal spray coating and heavy-duty paint coating in highly corrosive atmospheric environment. AIP Conf. Proc. 26 November 2020; 2309 (1): 020048. https://doi.org/10.1063/5.0035401
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