US2923747A - Prevention of corrosion - Google Patents

Prevention of corrosion Download PDF

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Publication number
US2923747A
US2923747A US726615A US72661558A US2923747A US 2923747 A US2923747 A US 2923747A US 726615 A US726615 A US 726615A US 72661558 A US72661558 A US 72661558A US 2923747 A US2923747 A US 2923747A
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percent
volume
corrosion
nitromethane
dioxane
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US726615A
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Donald E Rapp
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Dow Chemical Co
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Dow Chemical Co
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/38—Separation; Purification; Stabilisation; Use of additives
    • C07C17/42—Use of additives, e.g. for stabilisation

Definitions

  • the present invention relates to the prevention of the corrosion of metals by polychlorinated hydrocarbons.
  • nitromethane and 1,4-dioxane when employed in amounts as low as 0.1 percent by volume of solvent mixture will substantially inhibit the corrosive attack of the polychlorinated hydrocarbons on aluminum.
  • These components of the new composition can be employed in amounts of from 95 to 5 percent by volume of nitromethane to 5 to 95 percent by volume of 1,4-dioxane. Good results have been obtained when the ratio of components is about 1 to 1 and .the composition is employed in amounts of from 0.1 to 3 percent by volume of the halogenated hydrocarbon solvent.
  • Example 1 A 50 ml. portion of commercial methylene chloride containing one or more of the various impurities found in degreasing baths was heated at the reflux temperature until visual observation showed black spots and/or pits on and in a 28 aluminum strip suspended half in the liquid phase and half in the vapor phase of the refluxing solvent.
  • the following table records the results of the visual observations:
  • AMethylene chloride B-Methylene chloride plus 0.5 percent by volume of vinylidene chloride "ice C-Methylene chloride plus 1 gram of Fe O DMethylene chloride plus 0.5 percent by volume of vinylidene chloride plus 1 gram of Fe O Days to Example Test Solution First N 0. Visual Corrosion 1 A.- 26 2 B--- 8 (l-.. 5 4 D.-- 10 5 B Plus 3 percent by vol. 1,4-dioxane 99 6 D Plus 3 percent by vol 1-4-dioxane..- 89 7 B Plus 3 percent by vol mtromethaue... 90 8 D Plus 3 percent by vol. nitromethane... 98 9 D+1 percent by vol.
  • 1,4-dioxane 1 percent nitromethane 216
  • nitromethane and 1,4-diox'ane inhibits the corrosion of aluminum when subjected to chlorinated hydrocarbons up to at least 2 /2 times to 3 times as long as either compound alone when employed in equivalent amounts.
  • Hydrocarbon solvents which are inhibited in the same manner are, in general, any polychlorinated aliphatic hydrocarbon, such as'for example, carbon tetrachloride, 1,2-dichloroethane, 1,1,1-trichloroethane, tetrachloroethylene, chloroform and trichloroethylene.
  • any polychlorinated aliphatic hydrocarbon such as'for example, carbon tetrachloride, 1,2-dichloroethane, 1,1,1-trichloroethane, tetrachloroethylene, chloroform and trichloroethylene.
  • a polychlorinated aliphatic hydrocarbon corrosion inhibitor composition comprising a mixture of from 5 to percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-diox'ane, respectively.
  • a corrosion inhibitor for use with polychlorinated aliphatic hydrocarbons which comprises a mixture of from 5 to 95 percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-dioxane.
  • a corrosion inhibited polychlorinated hydrocarbon composition comprising a polychlorinated aliphatic hydrocarbon and from 0.1 to 3 percent by volume of a mixture consisting of .from 5 to 95 percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-dioxane, respectively.

Description

PREVENTION OF CORROSION Donald E. Rapp, Midland, Mich., assignor to The Dow Chemical Company, Midland, Mich., a corporation of Delaware No Drawing. Application April 7, 1958 Serial No. 726,615
3 Claims. (Cl. 260-6525) The present invention relates to the prevention of the corrosion of metals by polychlorinated hydrocarbons.
. Various metals are attacked by the polychlorinated aliphatic hydrocarbon solvents which are employed in degreasing operations and the like. Many inhibitor compositions have been suggested and employed to control this corrosion. It has been found that aluminum metal presents the most diflicult corrosion problems and that control of corrosion of aluminum is the ultimate goal to be achieved.
It has been found that a mixture of nitromethane and 1,4-dioxane when employed in amounts as low as 0.1 percent by volume of solvent mixture will substantially inhibit the corrosive attack of the polychlorinated hydrocarbons on aluminum. These components of the new composition can be employed in amounts of from 95 to 5 percent by volume of nitromethane to 5 to 95 percent by volume of 1,4-dioxane. Good results have been obtained when the ratio of components is about 1 to 1 and .the composition is employed in amounts of from 0.1 to 3 percent by volume of the halogenated hydrocarbon solvent.
The following examples illustrate the present invention but are not to be construed as limiting.
Example 1 A 50 ml. portion of commercial methylene chloride containing one or more of the various impurities found in degreasing baths was heated at the reflux temperature until visual observation showed black spots and/or pits on and in a 28 aluminum strip suspended half in the liquid phase and half in the vapor phase of the refluxing solvent. The following table records the results of the visual observations:
Test solutions:
AMethylene chloride B-Methylene chloride plus 0.5 percent by volume of vinylidene chloride "ice C-Methylene chloride plus 1 gram of Fe O DMethylene chloride plus 0.5 percent by volume of vinylidene chloride plus 1 gram of Fe O Days to Example Test Solution First N 0. Visual Corrosion 1 A.- 26 2 B--- 8 (l-.. 5 4 D.-- 10 5 B Plus 3 percent by vol. 1,4-dioxane 99 6 D Plus 3 percent by vol 1-4-dioxane..- 89 7 B Plus 3 percent by vol mtromethaue... 90 8 D Plus 3 percent by vol. nitromethane... 98 9 D+1 percent by vol. 1,4-dioxane 1 percent nitromethane 216 Thus it is apparent that the combination of nitromethane and 1,4-diox'ane inhibits the corrosion of aluminum when subjected to chlorinated hydrocarbons up to at least 2 /2 times to 3 times as long as either compound alone when employed in equivalent amounts.
Hydrocarbon solvents which are inhibited in the same manner are, in general, any polychlorinated aliphatic hydrocarbon, such as'for example, carbon tetrachloride, 1,2-dichloroethane, 1,1,1-trichloroethane, tetrachloroethylene, chloroform and trichloroethylene.
I claim:
1. A polychlorinated aliphatic hydrocarbon corrosion inhibitor composition comprising a mixture of from 5 to percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-diox'ane, respectively.
2. A corrosion inhibitor for use with polychlorinated aliphatic hydrocarbons which comprises a mixture of from 5 to 95 percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-dioxane.
3. A corrosion inhibited polychlorinated hydrocarbon composition comprising a polychlorinated aliphatic hydrocarbon and from 0.1 to 3 percent by volume of a mixture consisting of .from 5 to 95 percent by volume of nitromethane and from 95 to 5 percent by volume of 1,4-dioxane, respectively.

Claims (1)

1. A POLYCHLORINATED ALIPHATIC HYDROCARBON CORROSION INHIBITOR COMPOSITION COMPRISING A MIXTURE OF FROM 5 TO 95 PERCENT BY VOLUME OF NITROMETHANE AND FROM 95 TO 5 PERCENT BY VOLUME OF 1,4-DIOXANE, RESPECTIVELY.
US726615A 1958-04-07 1958-04-07 Prevention of corrosion Expired - Lifetime US2923747A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049571A (en) * 1960-03-18 1962-08-14 Dow Chemical Co Stabilized degreasing solvent
US3159582A (en) * 1960-02-23 1964-12-01 Ethyl Corp Stable solvent compositions
US3189552A (en) * 1963-02-05 1965-06-15 Ethyl Corp Stable solvent composition
US3192273A (en) * 1961-08-14 1965-06-29 Pittsburgh Plate Glass Co Stabilization of methylchloroform
US3238137A (en) * 1961-03-29 1966-03-01 Ethyl Corp Stable solvent compositions
US3282853A (en) * 1964-03-24 1966-11-01 Du Pont Azeotropic composition and process for attenuating magnetic ink characters
US3532761A (en) * 1969-05-07 1970-10-06 Ppg Industries Inc Stabilization of methyl chloroform
US3536766A (en) * 1968-12-26 1970-10-27 Dow Chemical Co Stabilized methyl chloroform composition
JPS4874103A (en) * 1971-12-29 1973-10-05
US4026956A (en) * 1972-09-13 1977-05-31 Ppg Industries, Inc. Storage stabilized methylchloroform formulations
US4524011A (en) * 1982-11-08 1985-06-18 The Dow Chemical Company Flux removal solvent blend

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371644A (en) * 1942-10-01 1945-03-20 Westvaco Chlorine Products Cor Degreasing process
US2371645A (en) * 1943-09-16 1945-03-20 Westvaco Chlorine Products Cor Degreasing process
US2436772A (en) * 1945-08-24 1948-02-24 Du Pont Solvent for degreasing iron and aluminum
US2567621A (en) * 1950-05-23 1951-09-11 Diamond Alkali Co Stabilized tetrachloroethylene composition
US2811252A (en) * 1954-03-30 1957-10-29 Dow Chemical Co Methyl chloroform inhibited with dioxane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371644A (en) * 1942-10-01 1945-03-20 Westvaco Chlorine Products Cor Degreasing process
US2371645A (en) * 1943-09-16 1945-03-20 Westvaco Chlorine Products Cor Degreasing process
US2436772A (en) * 1945-08-24 1948-02-24 Du Pont Solvent for degreasing iron and aluminum
US2567621A (en) * 1950-05-23 1951-09-11 Diamond Alkali Co Stabilized tetrachloroethylene composition
US2811252A (en) * 1954-03-30 1957-10-29 Dow Chemical Co Methyl chloroform inhibited with dioxane

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159582A (en) * 1960-02-23 1964-12-01 Ethyl Corp Stable solvent compositions
US3049571A (en) * 1960-03-18 1962-08-14 Dow Chemical Co Stabilized degreasing solvent
US3238137A (en) * 1961-03-29 1966-03-01 Ethyl Corp Stable solvent compositions
US3192273A (en) * 1961-08-14 1965-06-29 Pittsburgh Plate Glass Co Stabilization of methylchloroform
US3189552A (en) * 1963-02-05 1965-06-15 Ethyl Corp Stable solvent composition
US3282853A (en) * 1964-03-24 1966-11-01 Du Pont Azeotropic composition and process for attenuating magnetic ink characters
US3536766A (en) * 1968-12-26 1970-10-27 Dow Chemical Co Stabilized methyl chloroform composition
US3532761A (en) * 1969-05-07 1970-10-06 Ppg Industries Inc Stabilization of methyl chloroform
JPS4874103A (en) * 1971-12-29 1973-10-05
JPS5319161B2 (en) * 1971-12-29 1978-06-19
US4026956A (en) * 1972-09-13 1977-05-31 Ppg Industries, Inc. Storage stabilized methylchloroform formulations
US4524011A (en) * 1982-11-08 1985-06-18 The Dow Chemical Company Flux removal solvent blend

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