Detection method for macroscopic corrosion resistance of cold-rolled electroplated tin steel plate coating

The invention discloses a method for detecting macroscopic corrosion resistance of a cold-rolled electroplated tin steel plate coating. The method mainly solves the technical problem that the macroscopic corrosion resistance of an existing cold-rolled electroplated tin steel plate coating cannot be accurately detected. The invention discloses a method for detecting the macroscopic corrosion resistance of a cold-rolled electroplated tin steel plate coating. The method comprises the following steps: 1) preparing a sample; 2) soaking the sample with water; 3) heating the sample, wherein the heating treatment is divided into two stages, in the first stage, the water and the sample are heated from a room temperature to 40-60 DEG C, and the temperature is kept for 15-90 min; in the second stage, the water and the sample are heated, the temperature is increased to 90 DEG C or above, and heat preservation is performed for 40-300 min; then taking out the sample from the water; and drying the sample; and 4) calculating