The patented combination of anodic and cathodic inhibitors forms a film on the steel and ferrous alloys. The inhibitors promote protective surface films of gamma iron oxide and reduce the diffusion of dissolved oxygen and corrosive anions to the base metal layers. In addition, a combination of several advanced polymeric dispersants and oxidant-resistant organic phosphonates provides control of calcium carbonate, calcium sulphate and calcium phosphate scale formation. The scale inhibition mechanisms perform across a wide pH range.