Pipeline metal coating corrosion evaluation method

The invention discloses a corrosion evaluation method for a metal coating of a pipeline. The method comprises the following steps: by taking a metal coating pipeline as a test material, carrying out a corrosion simulation experiment by adopting a high-temperature and high-pressure reaction kettle to determine the uniform corrosion rate of the coating of the metal coating pipeline so as to judge the uniform corrosion resistance of the metal coating, and determining the pitting corrosion rate of the coating so as to judge the pitting corrosion resistance of the metal coating. And determining the thickness reduction of the coating to judge the corrosion resistance of the metal coating, comprehensively evaluating the corrosion of the metal coating of the pipeline according to the uniform corrosion rate, the pitting corrosion rate and the thickness reduction data of the coating, and evaluating the service life of the metal coating. A high-temperature and high-pressure reaction kettle is used for carrying out a cor