Abstract
Under the conditions of recirculating water systems with mixed oxygen/hydrogen depolarization, the authors advise using nontoxic passivating inhibitors, among which the most promising are phosphorus containing reagents, particularly polyphosphates and their combinations with inorganic and organic additives, which give a high level of protection even at concentrations of 15-20 mg/liter. At the Odessa Petroleum Refinery, a combination of sodium nitrite and sodium tripolyphosphate (TPP) has made it possible to achieve more than 85% protection (St3 steel) with a total component concentration of 100-200 mg/liter, with practically no local corrosion in the system. TPP is especially promising when the change is made to industrial installations with closed water systems with combined treatment of water.
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