Low hazard corrosion inhibitors and cleaning solutions using quaternary ammonium salts

A low hazard corrosion inhibitor used to inhibit corrosion of steel in organic acids, chelating agents and inorganic acids, comprising:

• about 20-50 percent-by-weight of a mixture of a reaction product and a solvent, said solvent selected from the group consisting of propylene glycols, propylene glycol ethers and mixtures thereof and wherein said reaction product is formed in said solvent by contacting a tertiary aromatic ammonium compound with a second compound having the formula RX where R is aliphatic, substituted aliphatic or alkyl aryl and X is a monovalent anion;
• about 1-10 percent-by-weight of a sulphur-containing compound;
• about 0-10 percent-by-weight of a nonionic surfactant;
• and
• the balance selected from the group consisting of said solvent, water and mixtures thereof.

A low hazard corrosion inhibitor used to inhibit corrosion of steel in organic acids, chelating agents and inorganic acids, comprising:

• about 20-50 percent-by-weight of a mixture of a reaction product and a solvent, said solvent selected from the group consisting of the propylene glycol aliphatic ethers having from about 1 to about 4 carbon atoms and the propylene glycol phenyl ethers wherein said reaction product is formed in said solvent by contacting a tertiary ammonium compound selected from the group consisting of pyridine, alkyl pyridine, quinoline, alkyl quinoline and mixtures thereof with a second compound selected from the group consisting of alkyl and alkyl aryl halides having from about 6 to about 18 carbon atoms, said tertiary ammonium compound and second compound present in about equal molar ratios;
• about 1-10 percent-by-weight of a sulfur-containing compound having sulfur in the minus two oxidation state;
• about 0-10 percent-by-weight of a nonionic surfactant selected from the group consisting of ethoxylated nonyl phenols, alkyl aryl polyether alcohols, aliphatic polyether alcohols, alcohol ethoxy sulfates and alkyl sulfonated diphenyl oxides;
• the balance selected from the group consisting of said solvent, water and mixture thereof.