Diquaternary compounds for corrosion inhibition and methods of use thereof

A corrosion-inhibiting composition comprising:

• an alkyl diquaternary compound having at least one of the following structures:
• wherein:
• R is a linear C8-C30 alkyl group,
• R1, R2, and R3 are independently a linear C1-C3 alkyl group,
• R4 is H, —OCH3, or C1-C8 alkyl group,
• R5 is a linear C1-C3 alkyl group, and
• X— is a halide, and
• a solvent.