Corrosion inhibitors and methods for reducing or inhibiting corrosion of metals in aqueous systems are provided. Corrosion inhibitor compositions may include tetracarboxylic acids, such as butane tetracarboxylic acid. The compositions may include other components, such as zinc, molybdate, silicate, cerium, among others. The compositions may also include polymers or oligomers. The corrosion inhibitor compositions produced synergistic results and unexpectedly low corrosion rates.

A solution is provided comprising a strong base, a corrosion inhibitor, wherein the strong base is an alkali metal hydroxide, wherein the corrosion inhibitor is at least one of an organic acid having a-COOH functional group or an alkali metal salt one of an organic acid having a-COOH functional groups.

An organic blend chemical additive comprising more than 50 wt. % organic solvent (e.g. methanol and/or ethylene glycol), less than 10 wt. % water, a nitrate salt, a maleic acid copolymer, and optionally an imidazoline may be delivered to a production well through a conduit having a stainless steel and corrosion resistant metal alloy surface, such as a capillary string or an umbilical tubing, the organic blend chemical additive being shown to be useful in inhibiting localized corrosion of and improving the repassivation of the equipment or conduit.

An organic blend chemical additive comprising more than 50 wt. % organic solvent (e.g. methanol and/or ethylene glycol), less than 10 wt. % water, a nitrate salt, a maleic acid copolymer, and optionally an imidazoline may be delivered to a production well through a conduit having a stainless steel and corrosion resistant metal alloy surface, such as a capillary string or an umbilical tubing, the organic blend chemical additive being shown to be useful in inhibiting localized corrosion of and improving the repassivation of the equipment or conduit.

A process for preparing an anticorrosion component for an antifreeze by oxidizing an oxydiol of the formula (I) ##STR00001##
with molecular oxygen at a temperature of 20 to 100 C. and a partial oxygen pressure of 0.01 to 2 MPa in the presence of water and of a heterogeneous catalyst. The catalyst contains platinum to form an oxydicarboxylic acid of the formula (II) ##STR00002##
The process has the steps of conducting the oxidation
(a) at a molar ratio of
0.002n(Pt)/[n(oxydiol (I))+n(oxydicarboxylic acid (II))]0.019;
(b) at a concentration of water of 50% to 95% by weight in the liquid phase; and
(c) at a pH of 1 to 7.

A passive cathodic protection process for preservation of em bedded metallic foundations entails embedding a wrap around a metallic foundation. The wrap has an outer sheath and an inner absorbent mat to be in direct contact with the metallic foundation. The is also mat hydrophobic. The wrap is subsumed such that an upper edge of the wrap is accessible. An oil-based metallic soap is injected via the upper edge to impregnate the mat. The metallic soap is selected from a set of metallic soaps such that the metal of the metallic soap is more electropositive than the metal of the metallic foundation such that the metallic soap acts as an anodic solution for galvanic exchange with metal within the em bedded metallic foundation for the passive cathodic protection thereof. For example, zinc naphthenate may be selected for steel or aluminium foundations thereby allowing for both passive cathodic protection and biocidal action.

Disclosed are curable coating compositions, and methods of cathodic corrosion protection using the compositions. For example, a curable coating composition comprising a mixed salt of magnesium thiodialkanoate, and a method for applying the coating composition, which when applied onto a steel or other ferrous substrate provides an anticorrosive coating, effective for improving resistance to cathodic disbondment.

The present disclosure is directed to methods, systems and apparatuses for predictively selecting plant extracts for their inclusion in formulations to imparting anti-corrosion properties to coatings for aluminum, aluminum alloys, copper and copper alloys.

The present invention relates to development of high performing oil soluble and water dispersible corrosion inhibitor composition for mitigating internal corrosion of crude oil pipelines during storage and transportation of crude oils. The developed composition consists of acid-amine complex as corrosion inhibiting agent, mixture of organic acids as dispersing agent and ester derivative of alkylated phenol for better film formation. The present invention further relates to a process of preparation of the oil soluble and water dispersible corrosion inhibitor composition and subsequently a process for protecting the corrosion of internal metal surface of crude oil transportation pipelines using the corrosion inhibitor composition.

A process for preparing an anticorrosion component for an antifreeze by oxidizing an oxydiol (I)

##STR00001##

in which x is 0 (zero) or a positive integer from 1 to 10 with molecular oxygen at a temperature of 20 to 100 C. and a partial oxygen pressure of 0.01 to 2 MPa in the presence of water and of a heterogeneous catalyst comprising platinum to form an oxydicarboxylic acid (II)

##STR00002##

in which y is 0 (zero) or a positive integer from 1 to 10, in which the oxidation is conducted
(a) at a molar ratio of

0.002n(Pt)/[n(oxydiol (I))+n(oxydicarboxylic acid (II))]0.019 where n(Pt) Is the molar amount of platinum, n(oxydiol (I)) is the molar amount of oxydiol (I) and n(oxydicarboxylic acid (II)) Is the molar amount of oxydicarboxylic acid (II);
(b) at a concentration of water of 50% to 95% by weight in the liquid phase; and
(c) at a pH of 1 to 7.