Addition product, production and use thereof as corrosion inhibitor

a technology of corrosion inhibitor and product, which is applied in the direction of coating, organic chemistry, metallic material coating process, etc., can solve the problems of limited protective effect duration, laborious process, and small content of conversion layer ions with inhibiting effect, and achieve rapid and lasting inhibition of corrosion processes

Inactive Publication Date: 2004-09-02
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] It is the object of the present invention to overcome the disadvantages of the prior art and to make available corrosion inhibitors that guarantee a rapid and lasting inhibition of corrosion processes.

Problems solved by technology

Such methods have the disadvantage that it is very laborious to carry out the process.
However, it is primarily disadvantageous that the conversion layer contains only a small content of the ions with inhibiting effect.
Because of this, the duration of the protective effect is limited.
However, the above-named salts have the disadvantage that their solubility in water is not very high and their suitability for a rapid protection of a damaged point in the metal is therefore low.
In addition, the efficacy potential of these salts is lower than that of the particularly effective chromates.
However, due to the high toxicity of chromium compounds (hexavalent chromium is carcinogenic and mutagenic) it is necessary to replace them by less toxic substitutes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Synthesis of 1H-benzotriazole Hexafluorosilicate

[0042] 100.1 g of 1H-benzotriazole is added under stirring over the course of half an hour to 242 g of a 25% aqueous solution of hexafluorosilicic acid. The first portions dissolve and become clear. In the later stage of the reaction, the resulting reaction product partly precipitates again already. After addition of the 1H-benzotriazole is complete, 300 mL of 96% ethanol is added and the mixture is stirred for two hours. The resulting precipitate is filtered off in a Buchner funnel and the filter cake is dried under vacuum at 50.degree. C. until constant weight is achieved. In order to obtain further product, the filtrate is concentrated to half and the precipitate is treated in the same. way as the main amount of the product. The dried product is ground in the ball mill and is screened with a 30 .mu.m screen.

example 2

[0043] Synthesis of 1H-benzotriazole Hexafluorotitanate

[0044] The synthesis is carried out as described in Example 1, with 115 g of a 60% hexafluorotitanic acid being used instead of the hexafluorosilicic acid.

example 3

[0045] Synthesis of 1H-benzotriazole Hexafluorozirconate

[0046] The synthesis is carried out as described in Example 1, with 193 g of a 45% hexafluorozirconic acid being used instead of the hexafluorosilicic acid.

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Abstract

The invention relates to an addition product that can be produced from hexafluorosilicic acid, hexafluorotitanic acid, and / or hexafluorozirconic acid by an acid-base reaction with one or several organic bases and a method for production and use thereof. The addition products according to the invention guarantee a rapid and lasting inhibition of corrosion processes; they are in particular suitable for inhibiting the corrosion of light metals.

Description

[0001] The invention relates to an addition product, its production from one or several organic bases and one or several of the acids hexafluorosilicic acid, hexafluorotitanic acid, and hexafluorozirconic acid, and its use as corrosion inhibitor, in particular for the protection of light metals.PRIOR ART[0002] For the corrosion protection of light metals or light metal alloys, conversion baths with the corrosion inhibitors hexafluorosilicic acid, hexafluorotitanic acid, and hexafluorozirconic acid are used. The light metals are treated by immersing them in the acid bath for a given time. A conversion layer forms hereby that protects the treated metal from corrosion. For prior art, reference is made here to WO 9967029 by way of example.[0003] Such methods have the disadvantage that it is very laborious to carry out the process. Various cleaning and rinsing baths precede and follow the actual treatment in the acid bath. However, it is primarily disadvantageous that the conversion laye...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D249/18C23F11/08C23F11/14
CPCC07D249/18C23F11/143C23F11/08
Inventor HARTWIG, ANDREASALBINSKY, KERSTIN
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
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