定期检查以确定无外部腐蚀。
根据要求，外部腐蚀防护由环氧涂料构成。
External corrosion protection consisting of epoxy paint depending on requirements.
外部腐蚀主要是大气腐蚀、土壤腐蚀、杂散电流腐蚀等。
Exterior corrosion includes atmospheric corrosion, soil corrosion and stray current corrosion as well.
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