The invention comprises synergistic compositions of at least one metal polycarboxylate and lithium phosphate. The synergistic compositions are designed to be added to film-forming or other compositions to reduce the corrosion of various metal surfaces or substrates on which the synergistic compositions are applied.

Methods and systems for converting inactive chemicals into active chemicals in-situ for treating oil and gas pipelines, other industrial systems, or sanitizing surfaces. Also, methods of treating an oil and gas pipeline including feeding an inactive additive through a first conduit and into a second conduit, the second conduit is in fluid communication with the first conduit and the oil and gas pipeline. The inactive additive is converted into an active additive within the second conduit and introduced into the oil and gas pipeline.

Methods and systems for converting inactive chemicals into active chemicals in-situ for treating oil and gas pipelines, other industrial systems, or sanitizing surfaces. Also, methods of treating an oil and gas pipeline including feeding an inactive additive through a first conduit and into a second conduit, the second conduit is in fluid communication with the first conduit and the oil and gas pipeline. The inactive additive is converted into an active additive within the second conduit and introduced into the oil and gas pipeline.

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.

The invention relates to a silicate-containing coolant concentrate, including at least one freezing-point lowering liquid, at least one mixture of at least two saturated, aliphatic dicarboxylic acids, at least one saturated aliphatic or hydroxyl-containing aromatic mono-carboxylic acid, at least one azole, at least one stabilizing silicate, at least one phosphonocarboxylic acid, and at least one heteropoly complex anion from the group IIIA to VIA of the periodic table of the elements.

The invention relates to a silicate-containing coolant concentrate, including at least one freezing-point lowering liquid, at least one mixture of at least two saturated, aliphatic dicarboxylic acids, at least one saturated aliphatic or hydroxyl-containing aromatic mono-carboxylic acid, at least one azole, at least one stabilizing silicate, at least one phosphonocarboxylic acid, and at least one heteropoly complex anion from the group IIIA to VIA of the periodic table of the elements.

Some metal surfaces are often unable to be contacted effectively with fluids containing hydrofluoric acid or acidic fluoride ions due to significant corrosion issues. Metal surfaces comprising titanium or a titanium alloy represent but one example. Corrosion inhibitor compositions comprising boric acid and other boron-containing compounds may at least partially suppress corrosion of titanium and titanium alloy surfaces. Methods for suppressing corrosion may comprise: introducing a treatment fluid comprising hydrofluoric acid or a hydrofluoric acid-generating compound to a subterranean formation; forming an at least partially spent treatment fluid in the subterranean formation; adding a corrosion inhibitor composition comprising a boron-containing compound to the subterranean formation, thereby forming an inhibited, at least partially spent treatment fluid in the subterranean formation; and contacting the inhibited, at least partially spent treatment fluid with a metal surface comprising titanium or a titanium alloy.

Some metal surfaces are often unable to be contacted effectively with fluids containing hydrofluoric acid or acidic fluoride ions due to significant corrosion issues. Metal surfaces comprising titanium or a titanium alloy represent but one example. Corrosion inhibitor compositions comprising boric acid and other boron-containing compounds may at least partially suppress corrosion of titanium and titanium alloy surfaces. Methods for suppressing corrosion may comprise: introducing a treatment fluid comprising hydrofluoric acid or a hydrofluoric acid-generating compound to a subterranean formation; forming an at least partially spent treatment fluid in the subterranean formation; adding a corrosion inhibitor composition comprising a boron-containing compound to the subterranean formation, thereby forming an inhibited, at least partially spent treatment fluid in the subterranean formation; and contacting the inhibited, at least partially spent treatment fluid with a metal surface comprising titanium or a titanium alloy.

Heat transfer fluid concentrates include: a freezing point depressant, water, or a combination thereof; a carboxylate; an inorganic phosphate; an azole compound; calcium ions and/or magnesium ions; and a water-soluble polymer. Ready-to-use heat transfer fluids and methods for preventing corrosion in heat transfer systems are described.

Heat transfer fluid concentrates include: a freezing point depressant, water, or a combination thereof; a carboxylate; an inorganic phosphate; an azole compound; calcium ions and/or magnesium ions; and a water-soluble polymer. Ready-to-use heat transfer fluids and methods for preventing corrosion in heat transfer systems are described.