A cleaning solution for a turbine engine includes water; a first organic acidic component that comprises citric acid; a second organic acidic component that comprises glycolic acid; isopropylamine sulphonate; alcohol ethoxylate; triethanol amine; and sodium lauriminodipropionate. The cleaning solution has a pH value between about 2.5 and about 7.0.

A corrosion inhibition package for use with an aqueous acid composition, said package comprising: a terpene; a cinnamaldehyde or a derivative thereof; at least one amphoteric surfactant; and a solvent. Also disclosed are compositions comprising said corrosion inhibitor package. Preferably, the corrosion inhibition package meets the environmental requirements for classification as yellow according to the Norwegian North Sea offshore drilling regulatory requirements.

A corrosion inhibition package for use with an aqueous acid composition, said package comprising: a terpene; a cinnamaldehyde or a derivative thereof; at least one amphoteric surfactant; and a solvent. Also disclosed are compositions comprising said corrosion inhibitor package. Preferably, the corrosion inhibition package meets the environmental requirements for classification as yellow according to the Norwegian North Sea offshore drilling regulatory requirements.

A process for forming a descaling composition has the steps of macerating a bone meal with a dimethylamine solution, digesting the macerated bone meal with hydrochloric acid, neutralizing the digested bone meal with calcium oxide, treating the neutralized bone meal with sulfuric acid, and applying a refluxing treatment with dimethylamine and hydrazine hydrate. The process further includes removing the macerated bone meal solids from the dimethylamine solution and transferring the removed solids to an extraction tower prior to the step of digesting. The hydrochloric acid is circulated through the macerated bone meal. The treated bone meal and the sulfuric acid is filtered so as to produce a liquid phase and a solids phase. The liquid phase contains a phosphate amine. The dimethylamine and hydrazine hydrate are added to the liquid phase.

The present disclosure relates to compositions and methods for cleaning silica deposits from a turbine. A method of cleaning a turbine is disclosed that can include contacting a deposit on a surface of the turbine with a composition and removing at least a portion of the deposit from the surface of the turbine. The composition can include a tetrafluoroboric acid and a urea component, and the deposit includes silica.

Disclosed are metal cleaning formulations and methods of use. A formulation of the present teachings comprises one or more furoate esters such as ethyl 5-methyl-2-furoate and methyl 5-methyl-2-furoate. The formulations further comprise a base oil, which can be, for example, a naphthenic oil, a synthetic oil or a combination thereof. In some embodiments, a formulation can further comprise a metal protection additive and a lubrication additive. A variety of base oils, metal protection additives, and lubrication additives are suitable for use in the present teachings. Formulations of the present teachings are especially useful for the cleaning of metal products such as firearms. The cleaning power of a formulation of the instant teachings can exceed that required for US Military Specifications.

An additive comprising glucaric acid and/or glucaric acid salt may be added to an aqueous system in an effective amount to remove rust from a corroded metallurgy and inhibit further rust formation and/or corrosion of the metallurgy within the aqueous system, and also to passivate any metallurgy within an aqueous system, wherein the additive may not contain a phosphorous compound or an iron activating agent. The aqueous system may be an aqueous stream, a hydrocarbon stream containing water, a cooling tower, a boiler, a cooling water system, and combinations thereof.

An aqueous composition for reducing corrosive removal of material in pickling of metallic surfaces comprising bare and/or galvanized steel. The composition includes a mixture of a compound of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2 in which R.sup.1 and R.sup.2 are both H, and a compound of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2 in which R.sup.1 and R.sup.2 are each, independently of one another, an HO(CH.sub.2).sub.w group with w2. X and y are each, independently of one another, from 1 to 4 in each of the two compounds of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2. A process for pickling a metallic surface with reduced corrosive removal of material is disclosed.

An aqueous composition for reducing corrosive removal of material in pickling of metallic surfaces comprising bare and/or galvanized steel. The composition includes a mixture of a compound of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2 in which R.sup.1 and R.sup.2 are both H, and a compound of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2 in which R.sup.1 and R.sup.2 are each, independently of one another, an HO(CH.sub.2).sub.w group with w2. X and y are each, independently of one another, from 1 to 4 in each of the two compounds of the formula R.sup.1O(CH.sub.2).sub.xCC(CH.sub.2).sub.yOR.sup.2. A process for pickling a metallic surface with reduced corrosive removal of material is disclosed.

A treatment liquid is a treatment liquid for a semiconductor device, containing a fluorine-containing compound, a corrosion inhibitor, and calcium, in which the mass content ratio of the calcium to the fluorine-containing compound in the treatment liquid is 1.0?10.sup.?10 to 1.0?10.sup.?4.