초록 ▼

A method is disclosed for prevention or stoppage of sulfidation or sulfuric corrosion of metal surfaces in contact with fluids including sulfiding compounds, where the method involves the addition of a compound to the fluid, where the additive has a higher affinity for metal surfaces than sulfur. Th

A method is disclosed for prevention or stoppage of sulfidation or sulfuric corrosion of metal surfaces in contact with fluids including sulfiding compounds, where the method involves the addition of a compound to the fluid, where the additive has a higher affinity for metal surfaces than sulfur. The additive are group 15 of the periodic table of elements, fluorine-containing compounds, or mixtures or combinations thereof and are added in small quantities generally between about 0.001 ppm and about 20 ppm based on the amount of group 15 element or fluorine in the compound used. A protected metal surface is also disclosed which is coated with a protective coating comprising a group 15 element or fluorine and/or sulfur.

대표청구항 ▼

1. A method of prevention sulfidation of metals comprising the steps of:adding to a fluid including a sulfiding compound an effective amount of a preventative composition, where the composition reduces or prevents sulfidation by deactivating metal sites involved in the formation of atomic sulfur and

1. A method of prevention sulfidation of metals comprising the steps of:adding to a fluid including a sulfiding compound an effective amount of a preventative composition, where the composition reduces or prevents sulfidation by deactivating metal sites involved in the formation of atomic sulfur and/or sulfides at or on a surface of the metal and where the effective amount of the preventative composition is between about 0.2 ppm and about 0.8 ppm. 2. A method of stopping sulfidation of metals comprising the steps of:adding to a fluid including a sulfiding compound an effective amount of a preventative composition, where the composition stops or arrests further sulfidation of the metal by deactivating metal sites involved in the formation of atomic sulfur and/or sulfides at or on a surface of the metal and where the effective amount of the preventative composition is between about 0.2 ppm and about 0.8 ppm. 3. The method of claims 1 - 2 , wherein the composition comprises a compound having a higher affinity for the metal surface than the sulfiding compound. 4. The method of claims 1 - 2 , wherein the composition comprises an effective amount of a phosphorus in the form of a phosphorus-containing compound to reduce sulfidation of the metal. 5. The method of claim 4, wherein the phosphorus-containing compound comprises phosphorus, phosphines of formulas PH 3 , PRH 2 , PR 2 H, and R 3 P where each R is the same or different and is a C1 to C20 carbon-containing group including alkyl, aryl, alkaryl or aralkyl; phosphites including ammonium phosphites; alkali metal phosphites; alkaline metal phosphites; phosphites having organic counter ions; phosphates including ammonium phosphates; alkali metal phosphates; alkaline metal phosphates; p hosphates having organic counter ions; pyrophosphates including ammonium pyrophosphates; alkali metal pyrophosphates; alkaline metal pyrophosphates; pyrophosphates having organic counter ions; polyphosphates including ammonium polyphosphates; alkali metal polyphosphates; alkaline metal polyphosphates; polyphosphates having organic counter ions; thiophosphates; thiophoshites; or other phosphorus-containing compounds capable of inhibiting sulfuric corrosion of metal surfaces, or mixtures or combinations thereof. 6. A method of pre-treating metal surfaces comprising the steps of:contacting a metal surface with an effective amount of a pre-treating composition sufficient to deposit onto the metal surface a protective coating, where the coating prevents or reduces sulfidation of the metal by deactivating metal sites involved in the formation of atomic sulfur and/or sulfides at or on the surface, where the effective amount of the preventative composition is between about 0.2 ppm and about 0.8 ppm. 7. The method claim 6, wherein the pre-treating composition comprises an organo-phosphorus compound and the method further comprising the step of:oxidizing the organo-phosphorus compound to a phosphorus oxide compound. 8. The method claims 6 , wherein the phosphorus-containing compound comprises phosphorus, phosphines of formulas PH 3 , PRH 2 , PR 2 H, and R 3 P where each R is the same or different and is a C1 to C20 carbon-containing group including alkyl, aryl, alkaryl or aralkyl; phosphites including ammonium phosphites; alkali metal phosphites; alkaline metal phosphites; phosphites having organic counter ions; phosphates including ammonium phosphates; alkali metal phosphates; alkaline metal phosphates; phosphates having organic counter ions; pyrophosphates including ammonium pyrophosphates; alkali metal pyrophosphates; alkaline metal pyrophosphates; pyrophosphates having organic counter ions; polyphosphates including ammonium polyphosphates; alkali metal polyphosphates; alkaline metal polyphosphates; polyphosphates having organic counter ions; thiophosphates; thiophoshites; or other phosphorus-containing compounds capable of inhibiting sulfuric corrosion of metal surfaces, or mixtures or combinations thereof.