Formulation for corrosion inhibition

A corrosion inhibitor formulation comprising:

• a) at least one quaternary ammonium salt in a range of 10-50 weight % with respect to the formulation;
• b) at least one fatty acid methyl ester in a range of 10-50 weight % with respect to the formulation;
• c) at least one viscosity reducing agent in a range of 0-5.0 weight % with respect to the formulation;
• and
• d) at least one solubilizing agent in a range of 0.3-3 weight % with respect to the formulation,
• wherein the at least one quaternary ammonium salt to the at least one fatty acid methyl ester weight ratio is in a range of 1:0.2-1:5.0.