Corrosion inhibitor AT-CI-03 is designed for circulating cooling water system, heat exchanger equipment, boiler water and circulating water softening treatment, with good corrosion inhibition effect. After playing the role of corrosion inhibition, it will not produce precipitates that are difficult to dissolve in water, which can prolong the cleaning cycle of the system, prolong the service life of boilers and circulating water equipment, and reduce the operation cost.