Primer-converter corrosion

 

(57) Abstract:

The invention relates to the field of engineering, namely for corrosion protection of carbon steel large-size components and parts, pipes and other structures. The invention consists in that the known ground-rust Converter comprising phosphoric acid and zinc oxide, is mixed with the main effects of bismuth in the presence of complexone III-disodium salt of ethylenediaminetetraacetic acid. The use of the proposed composition of the Converter will significantly improve the durability anti-corrosion protection of parts of carbon steels to improve the manufacturability of large parts. table 2.

The invention relates to the field of engineering, namely for corrosion protection of carbon steel large-size components and parts, pipes and other structures.

Known methods of surface preparation (etching, blasting with silica sand, shot or oxide) is not always acceptable for large units. In addition, regulated temporal gaps, ensure no corrosion, before painting is not always adhered to on a consistent need for effective and simple for manufacturability methods of surface preparation-carbon steel before application of the paint film, devoid of the above disadvantages.

Widely known methods of removal or conversion of corrosion products by processing special compositions of various formulations containing phosphoric acid, tannin, corrosion inhibitor. Their disadvantage is the low warranty period of the applied protective coatings due to various reasons, chief of which is the lack of adhesion after removal of corrosion chemical compounds.

Known closest to the proposed primer-Converter corrosion of carbon steels, including phosphoric acid, zinc oxide and water (the Application of special coatings for corrosion protection of structures and surface treatment. Series "Corrosion and protection in the petroleum industry", Moscow, VNIIEM, 1974, S. 18).

The downside of it is after the formation of the products of interaction of iron oxide and oxides of zinc in the presence of

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C7H7BiO7pre-heated in 0.1 N solution of disodium salt of ethylenediaminetetraacetic acid, promotes adsorption of the formed complex compounds, forming strong ties with metals (metal oxides).

In the table the presence of moisture.

The purpose of the invention is the improved resistance perosamine films in the surface treatment of carbon steels under the application of the LCP and conservation.

Awseme the invention differs from the basic fact that its members included gallate basic bismuth (salt Gallo Algodonales acid) in the presence of 0.1 N solution of disodium salt of ethylenediaminetetraacetic acid at a ratio of components.

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Abbreviation

Na2H2V2H2O, M = 372,2

Chelate compounds formed by the disodium salt of ethylenediaminetetraacetic acid structural formula:

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It is important that this chelate compound as a whole is electrically neutral.

Schematically the interaction of 2-and 3-valent metal cations with the disodium salt of ethylenediaminetetraacetic acid can be expressed by the equations:

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Thus, all reactions between metal cations and chelating molecules correspond to the stoichiometric ratio of 1:1.

Cations

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The remainder of the molecule disodium salt of ethylenediaminetetraacetic acid.

When the reaction between metal cations and the molecule is ü these chelate compounds are little affected by temperature and organic solvents.

The presence of gallate, the main bismuth

As a result of research and experimental work on real products have advantages of the developed formulations primer converters corrosion. The use of gallate, the main bismuth in the presence of disodium salt of ethylenediaminetetraacetic acid brings a completely new quality in the processing of chemically carbon steels, generating perosamine film by converting FeO2O3, Fe3O4in irreversible complex compounds, which, like the phosphate film, inhibit the process of corrosion in harsh environments. In addition, the presence of bismuth ion increases radiation resistance. Unreacted gallate basic bismuth has a drying effect, the remains of which are easily removed with a cloth or vacuum cleaner.

Thus, the use of the proposed composition of the Converter will significantly improve the durability anti-corrosion protection of parts of carbon steels to improve the manufacturability of large products.

Primer-Converter corrosion of carbon steels containing process is Ino included gallate basic bismuth in the presence of 0.1 N solution of disodium salt of ethylenediaminetetraacetic acid in distilled water in the following ratio of components, g/l:

Phosphoric acid - 180 - 240

Zinc oxide - 4,2 - 5,6

Gallate basic bismuth - 40 - 80

The disodium salt of ethylenediaminetetraacetic acid of 0.1 N solution in distilled water - 160 - 320

Distilled water - 415,8 is 554.4

 

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