Process for surface treatment of metals

a metal surface treatment and metal technology, applied in the direction of detergent compounding agents, boron compounds, inorganic non-surface active detergent compositions, etc., can solve the problems of metal ions released into industrial waste water and/or the environment, damage to equipment, and negative effect of metal surface appearan

Inactive Publication Date: 2011-03-10
JOT HLDG
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Benefits of technology

[0017]The present invention is a unique acid solution that contains components that limit or eliminate the removal of undesirable metals from the equipment used to contain, transfer, spray and pump these aggressive acid cleaners. The solution disclosed herein and method f

Problems solved by technology

The removal of these impurities are of particular importance for metal surfaces since the surface may be subsequently conversion coated, anodized, and/or painted and without complete removal of impurities, the function and appearance of the metal surface would be negatively effected.
Although sulfuric acid solutions provide an excellent solvent media for the cleaning applications described above, they have the disadvantage of being too aggressive to metal surfaces and even when stainless

Method used

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  • Process for surface treatment of metals

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[0027]This invention is directed to an environmentally friendly process for treating metal making use of a formulation which includes sulfuric acid, water and one or more amines or sulfate salts of amines. Sulfuric acid will attack metal surfaces and does so more vigorously at higher concentrations and at elevated temperatures. Even so called inert alloys, such as stainless steel will be attacked by sulfuric acid of the appropriate concentration and temperatures. Addition of amines or amine salts will greatly reduce or eliminate the attack on stainless steel surfaces and will therefore, prevent metals present in these alloys from contaminating wastewater and subsequently the environment.

[0028]This inhibitive effect of amines and amine salts can be seen in Table 1 in which sulfuric acid corrosivity is compared with modified sulfuric acid. In Table 1, the sulfuric acid is modified by the addition of ammonia to the acid. When ammonia is added to sulfuric acid, in general, ammonium hydr...

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Abstract

An environmentally acceptable and comparatively safe acid cleaning solution containing sulfuric acid, water and amine containing inhibitors that adequately remove oxidation or contaminants from surfaces without excessively damaging equipment. The sulfuric acid is effective in removing impurities and contaminants, while the amine moieties or amine salts reduce the otherwise damaging effect of sulfuric acid on equipment and on human skin and tissue.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of and claims priority to U.S. Application Ser. No. 12 / 335,072, filed Dec. 15, 2008 and entitled PROCESS FOR SURFACE TREATMENT OF METALS, which is a continuation-in-part and claims priority to U.S. application Ser. No. 11 / 679,997, filed Feb. 28, 2007 and is entitled PROCESS FOR SURFACE TREATMENT OF METALS, both documents are hereby incorporated by reference herein to the extent permitted by law.FIELD OF INVENTION[0002]The present invention relates generally to a process for the use of a modified sulfuric acid agent for the purpose of cleaning, deoxidizing, descaling, polishing, and / or brightening surfaces. These modified sulfuric acid agents prevent the attack on metal equipment used in their application and reduce or eliminate the release of hazardous or harmful metals to industrial waste water streams and prevent detrimental environmental release of harmful metals such as chromium, nickel and m...

Claims

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Application Information

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IPC IPC(8): C23G1/02C22C28/00
CPCC11D3/042C11D3/044C11D3/046C11D3/30C11D7/04C23G1/103C11D7/10C11D11/0029C23G1/081C23G1/10C11D7/08C23G1/125
Inventor ADAIR, RICHARD E.LINDERT, ANDREAS
Owner JOT HLDG
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