Corrosion inhibitors

A new composition of matter which is the reaction product resulting from reacting at a temperature of from about 25.degree. C. to about 250.degree. C. for a time sufficient to complete the reaction as determined by halide or residual acid number titrations,

• (1) the product resulting from reacting, in the presence or absence of a suitable solvent,
• (A) at least one aliphatic .alpha.,.beta.-monoethylenically unsaturated aldehyde having from about 3 to about 6 carbon atoms;
• and
• (B) at least one organic polyamine represented by the formula ##STR6## wherein R is a divalent saturated C.sub.2 to C.sub.4 aliphatic hydrocarbon group;
• each R.sup.1 and R.sup.2 is independently hydrogen or a saturated alkyl amino or an alkyloxy group containing from 2 to about 4 carbon atoms or when two adjacent R.sup.2 groups are taken together, they form a bridging alkylene radical containing 2 carbon atoms such that the R group containing 2 carbon atoms and two adjacent R.sup.2 groups and two nitrogen atoms form a heterocyclic ring containing 4 carbon atoms and 2 nitrogen atoms;
• x has a value from 1 to about 8 and
• wherein components (A) and (B) are employed in a mole ratio of (A) to (B) of from about 1:1 to about 1:6;
• and
• (II)
• (A) at least one saturated or unsaturated, cyclic or acyclic aliphatic mono- or polycarboxylic acid having from about 2 to about 50 carbon atoms;
• or
• (B) at least one saturated or unsaturated, cyclic or acyclic aliphatic alkyl monohalide or alkyl polyhalide having from about 2 to about 50 carbon atoms;
• or
• (C) a combination of (A) and (B);
• wherein components (I) and (II) are employed in quantities which provide from about 0.4 to about 1 equivalent of carboxyl and/or halide groups from component (II) for each theoretically active amino hydrogen atom contained in component (I).