A corrosion inhibitor composition is described. The corrosion inhibitor composition includes 1 to 15 weight percentage (wt. %) of a polymer having at least one vinylpyrrolidone unit and at least one vinyl acetate unit, 0.1 to 1 wt. % of a thioamide having 2 to 20 carbon atoms, 1 to 5 wt. % of a thioalcohol having 2 to 8 carbon atoms, 1 to 3 wt. % of a surfactant, 0 to 15 wt. % of an aliphatic alcohol having 1 to 8 carbon atoms, 30 to 60 wt. % of a solvent, and each wt. % based on a total weight of the corrosion inhibitor composition. The present disclosure also describes a method for inhibiting corrosion of a metal with the corrosion inhibitor composition of the present disclosure.

A corrosion inhibition composition is disclosed comprising a zinc oxide, a zinc phosphate, a calcium silicate, an aluminum phosphate, a zinc calcium strontium aluminum orthophosphate silicate hydrate, a molybdate compound, a silicate compound, and a zinc phthalate compound.

A corrosion inhibition composition is disclosed comprising a zinc oxide, a zinc phosphate, a calcium silicate, an aluminum phosphate, a zinc calcium strontium aluminum orthophosphate silicate hydrate, a molybdate compound, a silicate compound, and a zinc phthalate compound.

The present invention provides a deoxidizing agent for boilers excellent in an oxygen removal effect under wide temperature conditions. The deoxidizing agent for boilers comprises (A) a hydroxylamine compound represented by the following general formula (I), (B) a heterocyclic compound having an N-substituted amino group, and (C) an aminophenol derivative represented by the following general formula (II),

##STR00001## wherein R.sup.1 and R.sup.2 each independently represent an alkyl group having 1 to 5 carbon atoms;

##STR00002## wherein R.sup.3 to R.sup.6 each independently represent any one of (a) the following general formula (III), (b) OR.sup.10 and (c) R.sup.11, at least one of R.sup.3 to R.sup.6 representing (a), and R.sup.10 and R.sup.11 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms;

##STR00003## wherein R.sup.7 represents a single bond or an alkylene group having 1 to 4 carbon atoms, and R.sup.8 and R.sup.9 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

A corrosion inhibition composition is disclosed comprising a zinc oxide, a zinc phosphate, a calcium silicate, an aluminum phosphate, a zinc calcium strontium aluminum orthophosphate silicate hydrate, a molybdate compound, a silicate compound, and a zinc phthalate compound.

Method for preparation of 5-alkylsalicylaldoximes with formula 1, where R is a C6-C16 alkyl group, consisting in that into a water-alcohol solvent system, p-alkylphenol, sodium hydroxide, chloroform and hydroxylamine are introduced, while in relation to the alkylphenol used, sodium hydroxide and chloroform are used in amounts from the stoichiometric amount to a 100% excess, and hydroxylamine is used in amounts from the stoichiometric amount to a 60% excess, and the reaction is carried out at a temperature of 60-75? C. for 1.5-4 h, and then, at a temperature of 20-30? C., the post-reaction mixture is acidified till the pH of the aqueous phase <7.0 is obtained, and next, an alcohol-water azeotrope is distilled off with an admixture of unreacted chloroform, the residue is mixed with a neutral C5-C10 hydrocarbon solvent, the layers are separated, and the solvent is distilled off from the organic phase.

Method for preparation of 5-alkylsalicylaldoximes with formula 1, where R is a C6-C16 alkyl group, consisting in that into a water-alcohol solvent system, p-alkylphenol, sodium hydroxide, chloroform and hydroxylamine are introduced, while in relation to the alkylphenol used, sodium hydroxide and chloroform are used in amounts from the stoichiometric amount to a 100% excess, and hydroxylamine is used in amounts from the stoichiometric amount to a 60% excess, and the reaction is carried out at a temperature of 60-75? C. for 1.5-4 h, and then, at a temperature of 20-30? C., the post-reaction mixture is acidified till the pH of the aqueous phase <7.0 is obtained, and next, an alcohol-water azeotrope is distilled off with an admixture of unreacted chloroform, the residue is mixed with a neutral C5-C10 hydrocarbon solvent, the layers are separated, and the solvent is distilled off from the organic phase.