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Multiple metal corrosion inhibitor

a corrosion inhibitor and metal technology, applied in the direction of additives, lubricant compositions, base materials, etc., can solve the problems of reducing the ability to protect the lubricant against copper and lead corrosion in engines, and materials may be corroding towards either copper or lead

Inactive Publication Date: 2010-07-08
CHASAN DAVID E +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduction of these materials leads to a reduction in ability to protect the lubricant against copper and lead corrosion in engines.
These materials may be corrosive towards either copper or lead or both.
Additionally, certain industrial oils are aggressive to zinc.

Method used

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  • Multiple metal corrosion inhibitor
  • Multiple metal corrosion inhibitor
  • Multiple metal corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0171]The following formulations are prepared in a 5W-30 SM type passenger car motor oil containing 0.05% phosphorus and friction modifiers in an API Group II base oil. Formulations are weight percent based on the total formulation.

weight percent1234567triazole metal—0.04——0.040.05—deactivator Atriazole metal——0.04———0.04deactivator Bborate ester———0.110.110.150.11

[0172]The borate ester is (R15O)3B where R15 is a mixed C5-C13 alkyl. The borate is employed at 60 ppm and 120 ppm B treat level.

[0173]The triazole metal deactivator A is 1-(di-(2-ethylhexyl)aminomethyl)-1,2,4-triazole. The triazole metal deactivator B is methyl-1-(di-(2-ethylhexyl)aminomethyl)-benzotriazole.

[0174]High Temperature Corrosion Bench Test is performed according to ASTM D 6594, 168 hours @ 135° C. Corrosion results are as follows in ppm increase by weight.

API service category1234567CH-4 limitsCI-4 limitsSn, ppm1111111 50 maxreportPb, ppm36829242210014367114120 max120 maxCu, ppm61424264418 20 max 20 maxCu D 130 ...

example 2

[0175]An additive mixture is prepared by blending together 5% by weight a succinimde dispersant, HITEC 646, 25% by weight 1-(di-(2-ethylhexyl)aminomethyl)-1,2,4-triazole and 70% by weight the borate ester (R15O)3B where R15 is a mixed C5-C13 alkyl.

[0176]The mixture is incorporated into a polyalkylene glycol industrial oil.

[0177]The following results for zinc corrosion in polyalkylene glycol (PAG) are below. Corrosion results are in ppm Zn obtained after 30 hours at 125° C.

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Abstract

Disclosed is a lubricant composition comprising a) a lubricant, b) a triazole metal deactivator, c) a borate ester and optionally d) an amine phosphate. The lubricants, e.g. engine oils or functional fluids exhibit low corrosion of lead, copper, iron and zinc. The metal deactivators are 1,2,4-triazoles, for example 1-(di-isooctylaminomethyl)-1,2,4-triazole or 1-(di-(2-ethylhexyl)aminomethyl)-1,2,4-triazole, or are benzotriazoles, for example 1-(2-methoxyprop-2-yl)tolyltriazole, 1-(1-cyclohexyloxypropyl)tolyltriazole, 1-(1-cyclohexyloxyheptyl)tolyltriazole or 1-(1-cyclohexyloxybutyl)tolyltriazole or 1-[bis(2-ethylhexyl)aminomethyl-4-methylbenzotriazole. The borate esters are for example triethyl borate, tripropyl borate, triisopropyle borate, tributyl borate, tripentyl borate, trihexyl borate, tricyclohexyl borate, trioctyl borate, triisooctyl borate, tridecyl borate, tri(C8C10) borate, tri (C12-C15) borate or oleyl borate. The amine phosphate are for examplewherein R33 is n-hexyl and R34 is C11-C14 branched alkyl, and when x=1 then y=2; when x=2 then y=1.

Description

[0001]This application is a continuation of application Ser. No. 12 / 012,590, filed Feb. 4, 2008, pending, which claims benefit of U.S. provisional application No. 60 / 899,946, filed Feb. 7, 2007, the contents of which applications are incorporated by reference.[0002]The present invention is aimed at controlling the corrosion of lead, copper, iron and zinc in lubricants. Lubricants are for example low ash, low phosphorus engine oils (engine fluids) or industrial oils.BACKGROUND[0003]Traditionally the protection of metal parts of ingnition engines has been provided by a combination of neutral to overbased detergents together with zinc dithiophosphate (ZnDTP).[0004]Exhaust gas after treatment systems for vehicles are now required in order to comply with Clean Air Legislation, i.e. new Japanese or European legislation. The efficiency of these systems can be impaired by lubricant ash—originating from metal, sulfur and phosphorus containing additives. Therefore the amount of ash containing...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M141/10C10M105/78
CPCC10M141/12C10M169/04C10M2203/1006C10M2209/1033C10M2215/223C10N2240/10C10M2223/043C10M2227/061C10M2227/062C10N2230/12C10N2240/00C10M2215/28C10N2030/12C10N2040/00C10N2040/25C10M133/44C10M139/00
Inventor CHASAN, DAVID E.RIBEAUD, MARC
Owner CHASAN DAVID E
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