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, Muye Yang, Haoxuan Yang, Kazuyoshi Muto, Hirokazu Miyata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Recently, in Japan, Al-5Mg alloy thermal spray coating was applied as a repair method to improve the anticorrosion 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.

Original languageEnglish
Title of host publicationFracture and Damage Mechanics
Subtitle of host publicationTheory, Simulation and Experiment
EditorsLuis Rodriguez-Tembleque, Ferri M. H. Aliabadi
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440456
DOIs
Publication statusPublished - Nov 26 2020
Event19th International Conference on Fracture and Damage Mechanics, FDM 2020 - Mallorca, Spain
Duration: Sep 15 2020Sep 17 2020

Publication series

NameAIP Conference Proceedings
Volume2309
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference19th International Conference on Fracture and Damage Mechanics, FDM 2020
Country/TerritorySpain
CityMallorca
Period9/15/209/17/20

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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