Antirust agent
a technology of anti-rust agent and volatile corrosion inhibitor, which is applied in the preparation of detergent mixture compositions, other chemical processes, and explosives. it can solve the problems of unsatisfactory corrosion inhibitory effect of resin (film) containing volatile corrosion inhibitor, deterioration of the cleanness of the surface of the metallic member, and inability to prevent rusting, so as to prevent rusting of the metallic member and maintain the clean surface. , the effect of preventing the rusting of the metalli
Inactive Publication Date: 2009-06-04
MITSUBISHI GAS CHEM CO INC +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present invention provides a corrosion inhibitor that prevents rusting of metallic members during long-term storage while maintaining cleanness of surfaces of the metallic members. The corrosion inhibitor comprises a hydroxylamine or hydrazine compound and a water-absorbable resin. The invention also includes a package product comprising the corrosion inhibitor and a gas-permeable material, and a method of inhibiting corrosion by maintaining a metallic member in a gas barrier container in the presence of the package product. The use of the corrosion inhibitor eliminates the need for a washing step after storage, reducing processing time and cost for chemical liquids.
Problems solved by technology
When the approach using a desiccant is employed, rusting cannot be prevented even under completely dry conditions, and further rusting is caused by oxygen and water which have permeated the wrapping material with elapse of time.
The conventional approach in which an object is wrapped in wrapping paper impregnated with a volatile corrosion inhibitor such as dicyclohexylammonium nitrite cannot be applied to storage of precision parts or similar parts, since a long period of time is required for fully attaining corrosion inhibitory effect through vaporization of the corrosion inhibitor, and the corrosion inhibitor component is deposited on a surface of a metallic member, thereby considerably deteriorating cleanness of the surface of the metallic member.
The approach in which an object is wrapped in a wrapping resin (film) containing a volatile corrosion inhibitor attains unsatisfactory corrosion inhibitory effect during wrapping of the object, since the volatile corrosion inhibitor is lost through vaporization during production of the wrapping resin, and the volatile corrosion inhibitor which has been incorporated into the resin is difficult to vaporize.
The approach in which a storage container is purged with an inert gas such as nitrogen or argon encounters difficulty in complete removal of oxygen contained in the storage container.
Even when the container is completely purged with inert gas, oxygen and water present outside the container material permeate the container with elapse of time, thereby causing rust.
Thus, as mentioned above, when conventional approaches are employed, rusting of metallic members during storage thereof for a long period of time cannot be prevented simultaneously with maintaining surfaces of the metallic members clean.
Method used
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Examples
Experimental program
Comparison scheme
Effect test
example 1
[0029]Polyethylene glycol diglycidyl ether (Denacol EX-841, product of Nagase Chemicals Ltd., epoxy equivalent: 370 g / eq) (82 parts) and glycerol polyglycidyl ether (Denacol EX-313, product of Nagase Chemicals Ltd., epoxy equivalent: 141 g / eq) (2 parts) (epoxy equivalent:active hydrogen equivalent=1:2.0), which had been heated to 60° C. in advance, were placed in a 500-mL beaker. To the mixture, benzyldimethylamine (0.1 parts) serving as a hardening accelerator was added, and the mixture was stirred. To the mixture, m-xylenediamine (active hydrogen equivalent: 34 g / eq) (16 parts) was added, and the mixture was stirred. The solution mixture was poured into an aluminum mold and heated in a drier at 80° C. for one hour and further at 120° C. for one hour, to thereby produce a hardened resin product. The hardened resin product was pulverized by means of a mortar, and the pulverized product (3 g) was immersed in a 5 wt. % aqueous hydroxylamine solution (100 mL) at 25° C. for 24 hours. Su...
example 2
[0033]The procedure of Example 1 was repeated, except that a 5 wt. % hydrazine was used instead of a 5 wt. % hydroxylamine. The results of the volatile corrosion inhibitor test are shown in Table 1.
example 3
[0034]The procedure of Example 1 was repeated, except that a 5 wt. % N,N-diethylhydroxylamine was used instead of a 5 wt. % hydroxylamine. The results of the volatile corrosion inhibitor test are shown in Table 1.
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Abstract
The present invention provides a corrosion inhibitor for preventing rusting of metallic members during long-term storage thereof while maintaining cleanness of surfaces of the metallic members, as well as a corrosion inhibiting method.The invention provides a corrosion inhibitor containing a hydroxylamine compound represented by formula (1):(wherein each of R1, R2, and R3 represents a hydrogen atom, a C1 to C6 alkyl group, or a C2 to C4 alkenyl group, and each of these groups may have a substituent), or a hydrazine compound represented by formula (2):(wherein each of R1, R2, R3, and R4 represents a hydrogen atom, a C1 to C6 alkyl group, or a C2 to C4 alkenyl group, and each of these groups may have a substituent) and a water-absorbable resin; the corrosion inhibitor wrapped in a gas-permeable material; and a method of inhibiting corrosion characterized by including maintaining a metallic member in a gas barrier container in the presence of the wrapped corrosion inhibitor.
Description
TECHNICAL FIELD[0001]The present invention relates to a corrosion inhibitor which exhibits an excellent corrosion inhibitory effect on a metallic material during storage thereof, and to a method of inhibiting corrosion.BACKGROUND ART[0002]Hitherto, there have been employed methods for preventing rust of metallic members caused by condensation of water vapor during storage thereof; e.g., an approach in which a metallic member is wrapped with a desiccant in a sealable material, an approach in which an object is wrapped in wrapping paper impregnated with a volatile corrosion inhibitor, and an approach in which an object is wrapped in a wrapping resin (film) containing a volatile corrosion inhibitor (see Patent Document 1). In an alternative approach, a storage container for metallic members is purged with inert gas. When the approach using a desiccant is employed, rusting cannot be prevented even under completely dry conditions, and further rusting is caused by oxygen and water which h...
Claims
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IPC IPC(8): C23F11/00
CPCC09D5/086C11D3/0073C23F11/02C11D7/3218C11D11/0023C11D7/3209C11D2111/14C23F11/00C23F11/14
Inventor TAKAHASHI, KENICHI
Owner MITSUBISHI GAS CHEM CO INC