Mechanistic Studies of Atmospheric Corrosion Behavior of Al and Al-based Alloys in a Tropical Marine

• 作 者: 崔中雨 GE Feng 李晓刚 ZHU Min XIAO Kui DONG Chaofang WANG Xin
• 机 构: Institute of Materials Science and Engineering, Ocean University of China,Corrosion and Protection C
• 出 处: Journal of Wuhan University of Technology(Materials Science)
• 发表日期: 2017年03期
• 关键词: Tropical fluctuation tropical initiate propagate exposed exposure Marine shipbui

Atmospheric corrosion behavior of pure Al 1050 A, 5A02 and 6A02 aluminum alloys exposed to a tropical marine environment for 4 years was investigated. Synergetic effect of Cl~-deposition rate and time of wetness resulted in an abnormal increase in weight loss and a significant fluctuation in corrosion rate. Pitting corrosion occurred on the three metals. Pits on 5A02 alloy were easy to initiate and inclined to propagate laterally to form higher corrosion area and shallower corrosion pits, while pits on 6A02 alloy presented the opposite appearances. This was further confirmed by the cyclic polarization experiments.

Synergetic effect of Cl ~ -deposition rate and time of wetness resulted in an abnormal increase in weight loss and a significant fluctuation in corrosion rate. Pitting corrosion occurred on the three metals. Pits on 5A02 alloy were easy to by and propagate laterally to form higher corrosion area and shallower corrosion pits, while pits on 6A02 alloy presented the opposite appearances. the cyclic polarization experiments.