This invention presents a novel corrosion inhibitor. In the preferred embodiment, the inventive corrosion inhibitor comprises extracellular polymeric substances (EPS). In one embodiment, the invention presents a novel EPS corrosion inhibitor using waste activated sludge (WAS). In this embodiment, WAS is heated to release EPS from the microbial mixture.

This invention presents a novel corrosion inhibitor. In the preferred embodiment, the inventive corrosion inhibitor comprises extracellular polymeric substances (EPS). In one embodiment, the invention presents a novel EPS corrosion inhibitor using waste activated sludge (WAS). In this embodiment, WAS is heated to release EPS from the microbial mixture.

The invention relates to a microemulsion comprising water in an amount of 1-30 w %; sodium or potassium oleate, Na/K salts of tall oil fatty acid, and/or Na/K salts of C16-C18 saturated or unsaturated fatty acids in an amount of 10-40 w %; oleic acid, tall oil fatty acid, or C16-C18 saturated or unsaturated fatty acids in an amount of 2-40 w %; ethanol in an amount of 0-40 w %; glycerol in an amount of 5-40 w %; and liquid hydrocarbon(s) in an amount of 5-40 w %, up to a maximum or total of components parts of 100 w %. Moreover, methods of manufacture and uses of the microemulsion are disclosed.

The invention relates to a microemulsion comprising water in an amount of 1-30 w %; sodium or potassium oleate, Na/K salts of tall oil fatty acid, and/or Na/K salts of C16-C18 saturated or unsaturated fatty acids in an amount of 10-40 w %; oleic acid, tall oil fatty acid, or C16-C18 saturated or unsaturated fatty acids in an amount of 2-40 w %; ethanol in an amount of 0-40 w %; glycerol in an amount of 5-40 w %; and liquid hydrocarbon(s) in an amount of 5-40 w %, up to a maximum or total of components parts of 100 w %. Moreover, methods of manufacture and uses of the microemulsion are disclosed.

Corrosion inhibitor formulations for use in heat transfer fluids include: (a) an optionally substituted benzoic acid or a salt thereof; (b) at least a first n-alkyl monocarboxylic acid or a salt thereof and a second n-alkyl monocarboxylic acid or a salt thereof, the first n-alkyl monocarboxylic acid and the second n-alkyl monocarboxylic acid being different; and (c) an azole compound. A ratio of weight percent of the first n-alkyl monocarboxylic acid or the salt thereof to weight percent of the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.75 to about 1:2.00. A ratio of weight percent of the benzoic acid or the salt thereof to combined weight percent of the first n-alkyl monocarboxylic acid or the salt thereof and the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.30 to about 1:2.25.

A corrosion inhibitor composition, containing (a) a cinnamaldehyde compound, (b) an alkoxylated fatty amine, and (c) an imidazoline compound, and optionally (d) a surfactant, and (e) a solvent. A method of inhibiting corrosion of metal in contact with an acidic medium in an oil or gas field environment by introducing the corrosion inhibitor composition into the acidic medium, such as during acid stimulation operations.

Compounds, compositions and methods are provided for reducing, inhibiting, or preventing corrosion of a surface, using a corrosion-inhibiting composition comprising a dispersant having the structure of Formula 1 and a corrosion inhibitor having the structure of Formula 2

##STR00001##

wherein X.sub.1 is hydroxyl, —OC(O)R.sub.1; X.sub.2 is hydroxyl, or —OC(O)R.sub.2; X.sub.3 is hydroxyl or —OC(O)R.sub.3; R.sub.1, R.sub.2, and R.sub.3 are independently C.sub.10 to C.sub.30 alkyl or alkenyl; m, n, and o are independently integers from 1 to 10; R.sub.20 , R.sub.21, R.sub.22, R.sub.23, and R.sub.24 are independently hydrogen or —C(O)—R.sub.31; R.sub.31 is C.sub.10 to C.sub.30 alkyl or alkenyl; p is an integer of 0 or 1; q is an integer of 1 to 4; r is an integer of 0 or 1; s is an integer of 0 or 1; t is an integer from 1 to 4; and p1, q1, r1, r2, s1, and t1 are independently integers from 1 to 6; wherein when p, r, and s are 0, q+t is an integer from 4 to 8 and at least one of R.sub.20 , R.sub.21, R.sub.22, R.sub.23, and R.sub.24 is —C(O)—R.sub.31.

The present invention relates to glycol based heat-transfer fluids exhibiting corrosion inhibition and comprising more than 5 wt. % (by total weight of the composition) of a glycol selected from the group consisting of monoethylene glycol, monopropylene glycol, 1,3-propanediol, glycerol or combinations thereof; and more than 1 wt. % (by total weight of the composition) of a short-chain organic carboxylic acid or salt thereof selected from the group consisting of C.sub.2 organic carboxylic acids or salts thereof, C.sub.3 organic carboxylic acids or salts thereof and combinations thereof; wherein the combined amount of the glycol and the short-chain organic carboxylic acid or salt thereof is more than 15 wt. % (by total weight of the composition). The invention further relates to concentrates for the preparation of said heat-transfer fluids, to methods for the preparation of said heat-transfer fluids, and to the methods and uses employing said heat-transfer fluids.

The present invention relates to heat-transfer fluids with low conductivity which comprise a base fluid and at least one aliphatic carboxamide and are useful for diverse applications, for example in fuel cells. it was found that aliphatic carboxamides significantly outperform aromatic carboxamides with regard to maintaining low conductivity upon aging at increased temperatures. Furthermore, it was surprisingly found that the compositions in accordance with the invention are capable of maintaining this low electrical conductivity upon aging at increased temperatures in the presence of aluminum substrates.

With the present invention, sustainable systems for corrosion, inhibition in the processing of metals (in particular iron, aluminum and magnesium) are made available. These systems being in full accordance with the principles of green chemistry comprise an amino acid as neutralizing component for an acidic corrosion inhibitor, whereby the amino acid is used in deprotonated form. The resulting metalworking fluids may be water- or oil-based or semi synthetic formulations. The neutralization of acidic corrosion inhibitors with the claimed system comprising an amino acid consistently achieves convincing results and, together with acidic corrosion inhibitors from corresponding sources, completely renewable systems for corrosion inhibition are provided.