Compositions – Electrolytes for electrical devices
Patent
1981-04-29
1982-12-28
Warren, Charles F.
Compositions
Electrolytes for electrical devices
252 495, 72 42, 72 46, C10M 106
Patent
active
043660770
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a fluid composition suitable for application to a metal surface. The composition may advantageously be used as a lubricant or coolant during metal working or for protection of coil or sheet packs of steel against corrosion.
The invention further relates to methods of use of the fluid composition.
During certain metal working operations it is usual to supply a fluid to the surface of the metal to be worked to reduce friction and also to cool the work piece. In a number of cases, for example, during temper rolling and high speed cutting of steel, aqueous fluids are preferred on the basis of their cleaning action.
The present invention will herein be described with particular reference to the example of temper rolling fluids but will be understood to be applicable to other aqueous metal working fluids such as cutting fluids.
BACKGROUND ART
In the past temper rolling fluids have generally contained a nitrite salt to inhibit corrosion and one or more organic amine compounds, for example triethanolamine, to serve as a secondary corrosion inhibitor, and to act as an ion complexant.
Such fluids suffer from a number of disadvantages, including:
1. A tendency to foam, with consequent problems during metal working.
2. A tendency to hygroscopicity resulting in a complaint known as "wet pack" in respect of coil or sheet packs of steel which manifests itself in an unsightly appearance of the steel surface and which is detrimental to paintability.
3. Complaints relating to welder tip life by users of the steel.
4. Significant problems in waste disposal and water treatment at rolling mills, caused by the inclusion in such fluids of amine compounds.
5. Because of the problems in pollution control which arise from previously used fluids, it has been practised to recirculate rolling fluids and this in turn has given rise to problems with corrosion inhibition, product cleanliness and degradation of the fluid.
It is an object of the present invention to provide a fluid the use of which avoids or at least ameliorates some or all of those problems. The present invention provides a rolling fluid which avoids most of the disadvantages previously described while having substantially similar or superior performance to known rolling fluids in most other respects. More particularly, compositions according to the present invention do not contain amines and after use are more acceptable for waste discharge into the environment either with or without waste treatment. The composition possesses a mild cleaning action and results in more effective cleaning of steel strip during temper rolling and less susceptibility to "wet pack" formation in comparison with previously used fluids, resulting in improved paintability of the steel surface. Composition according to the invention may be made suitable for use with steel intended for food grade application. Rolling fluids according to preferred embodiments are less susceptible to excessive foaming during use than previously used fluids and may be made at lower raw materials cost per unit volume and with lower waste discharge pollution loadings. The fluids may be applied at lower surface loadings than has been usual with fluids hitherto in use and inhibit corrosion in steel after unpacking when the steel is exposed to high humidity.
DISCLOSURE OF INVENTION
According to a first aspect the invention consists in a composition for application to a metal surface comprising:
According to a second aspect the invention consists in a composition according to the first aspect further comprising a glycol or polyol.
According to a third aspect the invention consists in a composition according to the first or second aspect further comprising a surfactant.
According to a fourth aspect the invention consists in the method of treating steel by applying to the surface thereof a solution according to any one of the preceding aspects.
BEST MODE OF CARRYING OUT THE INVENTION
Preferred embodiments of the invention will now be described with reference to the accompany
REFERENCES:
patent: 3425954 (1969-02-01), Ruzevick et al.
patent: 3931020 (1976-01-01), Burgess et al.
Andrew Barry E.
Mak Tak W.
Harris-Smith Y.
John Lysaght (Australia) Limited
Warren Charles F.
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