Measuring method and measuring apparatus, corrosion resistance test method and corrosion resistance test device for coated metal material

摘要

Problem to be solved: to provide a measuring method and a measuring apparatus for measuring the size of a wound, which is highly reliable, convenient and versatile, and a corrosion resistance test method and a corrosion resistance test apparatus for the coated metal material.A method of measuring the size of a wound that penetrates the surface treatment film formed in a coated metal material having a surface treatment film on a metal base material and reaches the metal substrateThe water containing material in contact with the wound and the electrode contacting the water containing material are arranged together with the waterThe electrical connection between the electrode and the metal substrate through an external circuitBy the above described external circuitThe electrode and the metal substrate are respectively made of cathode and anode.A constant voltage is applied between the two.Measuring the current value between the twoThe measured current value andThe correlation between the current value previously tested and the size of the woundsBased onTo calculate the size of the wound.Diagram