A polymeric additive for naphthenic acid corrosion inhibition and method of use thereof, the present invention relates to the field of corrosion inhibition of metals in hot acid hydrocarbons, the acidity of which is derived from the presence of naphthenic acid. More specifically, the present invention relates to a polymeric additive for the inhibition of corrosion caused by naphthenic acid at high temperatures, said polymeric additive being the polyisobutylene succinate ester phosphate polymeric ester or the oxide derivative. of the polyisobutylene succinate ester phosphate polymer ester. The present invention provides a polyisobutylene succinate ester phosphate polymer ester which is capable of acting as a naphthenic acid corrosion inhibitor by inhibiting corrosion caused by naphthenic acid in crude oil / feedstock / hydrocarbon streams containing naphthenic acid, and demonstrating greater thermal stability at varying temperatures, varying from about 200 ° C to about 400 ° C [from about 400 ° F to about 750 ° F].
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