Plain-English summary
Problem
How can corrosion in underground pipelines and conduits be prevented?
Solution
corrosion-resistance testing method for a coated metal member formed of a metallic substrate provided with a surface treatment coating includes an electrification step for applying a voltage and/or a current between a surface of the surface treatment coating and the metallic substrate while a corrosion factor is in contact with the surface of the surface treatment coating so as to measure a temporal change in a current and/or a voltage occurring between the surface of the surface treatment coating and the metallic substrate, and an evaluation step for evaluating a coating quality of the surface treatment coating based on at least one of a gradient of the temporal change when a value of the current and/or the voltage exceeds a predetermined value, an integrated value of the value of the current and/or the voltage within a predetermined time range, and a time average value of the integrated value.
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