Method of Inhibiting Corrosion of a Metal in an Industrial Water System

A method of inhibiting corrosion of a metal in an industrial water system, the method comprising:

• (i) treating water of the industrial water system with a corrosion inhibiting-effective amount of a phosphorus-based treatment program comprising a phosphorus-based compound to provide a first treated industrial water, and
• (ii) treating the first treated industrial water with a corrosion inhibiting-effective amount of a metal-containing treatment program to provide a second treated industrial water, to inhibit corrosion of metal in the system,
• wherein the metal-containing treatment program comprises a metal-based corrosion inhibitor comprising a metal atom having a phosphate salt water solubility of 1×10 g/L or less,
• wherein metal-containing treatment program does not contain zinc, and
• wherein the phosphorus-based treatment program is discontinued prior to or during treatment with the metal-containing treatment program.