The invention relates to a
heat exchanger electrochemically-induced film formation method in a circulating cooling water micro-alkalifying transition period. The method comprises the following steps: connecting a circulating cooling water
system heat exchanger with an active
metal zinc block to constitute a
primary cell, regulating the pH value of circulating water to 2-4, monitoring the
metal ion content of the circulating water in the operation process, and after 2-3 days, finishing cleaning when the rise trend slows down; as for a
brass heat exchanger, regulating the
system to alkality, adding an oxidizer, and forming a Cu2O passivating film on the surface after some time, wherein after the
cathode protection is removed, the Cu2O passivating film is gradually converted into a stable CuO passivating film, and afterwards, the
brass corrosion rate is less than 0.005 mm / a; and as for the a
carbon steel heat exchanger, adding Fe<2+> at one time, circulating for some time, regulating the solution to alkality, adding an oxidizer, removing
cathode protection after some time, and forming a compact
ferric oxide passivating film on the surface, wherein the
corrosion rate is less than 0.01mm / a. The method prevents local
corrosion and completes the circulating cooling water micro-alkalifying transition period.