The rust converter

 

(57) Abstract:

The invention relates in paint industry, namely modifiers rust, which are used to cover the rusty metal surfaces, including, as bactericides, to fight with sulfate-reducing bacteria and hydrogen sulfide corrosion resulting from the activity of sulfate reducing bacteria and prevent it from leaking. In addition, they can be used for drawing on a rusty metal surface with oil and oil contamination without uninstalling them, and be operated in the temperature range from minus 30 to 500oC. the rust Converter contains components in the following ratio, wt.%: phosphoric acid 43,0-51,0, graphite 27,0-34,0, cadmium oxalate 0,4-1,0, lignosulfonates 0,5-1,1, water - the rest. The rust Converter has a transformative capacity of about 200 μm, prevents hydrogen sulfide corrosion. table 1.

The invention relates to coatings industry, namely, modifiers, rust, used to cover the rusted metal surfaces.

Known modifier rust, containing ( wt.%): hydralisk is/A. C. The USSR 1595864, 09 D 5/12, Modifier rust." Appl. 15.06.88. Publ. 30.09.90 B-HB 36/.

The disadvantage of this Converter rust is the inability to use to fight against hydrogen sulfide corrosion and for application to rusty polluted or oily surfaces.

The closest technical solution chosen for the prototype is the modifier rust, containing phosphoric acid, kaolin, graphite and water /paint on rust - 79. Abstracts of the third all-Union scientific-technical seminar, Bitter, 1979, S. 45-46/.

The disadvantage of this modifier rust is also the inability to fight against hydrogen sulfide corrosion and deposition on the rusted surface with oil and oil pollution.

The problem to which the invention is directed, is to create a drug that can effectively convert the rust in non-corrosive connection and to protect the metal from sulfate-reducing bacteria and hydrogen sulfide corrosion, as well as for applying it on the rusted surface with oil and oil pollution.

The technical result obtained using the proposed Converter rust, who is knoth, with oil and oil pollution.

The task and the technical result is achieved by the fact that the known rust Converter in addition to orthophosphoric acid, graphite, water additionally contains oxalate cadmium and lignosulfonates in the following proportions of ingredients (wt. % ): orthophosphoric acid 43,0-51,0; graphite 27,0-34,0; lignosulfonates 0,5-1,1; cadmium oxalate 0,4-1,0; water - the rest,

Comparative analysis of the prototype allows us to conclude that the claimed composition of rust Converter differs from the known introduction of cadmium oxalate and lignosulfonates. Thus, the proposed solution meets the criterion of "novelty".

The technical result obtained when using the rust Converter containing phosphoric acid, graphite, lignosulfonates, cadmium oxalate and water, allows to solve an industrial problem - the fight against hydrogen sulfide corrosion and can be used on rusted metal surfaces with oil and oil contamination. This allows to make a conclusion about conformity of the invention, the criterion of "inventive step".

The rust Converter will receive the following about the m holes 0.125 mm graphite marks THE GSS 21-25-166-75 and cadmium oxalate (CdC2O4) consistently fall asleep in one measuring Cup and mix thoroughly. Then in the same glass poured with simultaneous mixing orthophosphoric acid brand "h" GOST 6552. The resulting mixture was homogenized.

In another glass, poured the powdered lignosulfonate TU technical-13-0281-036-15-90 and dissolve them in water GOST 2874. The resulting solution of lignosulfonate pour into a glass with a mixture of graphite, cadmium oxalate acid and phosphoric acid. After the ingredients are thoroughly mixed until syrupy homogeneous mass of dark gray with metallic luster, having a density of 1,588-1,593 g/cm3.

Example. To obtain 100 g of rust Converter in the beaker with a capacity of 200 ml asleep 30.5 g (30,5%) grade graphite REG THE 21-25-166-75, 0.7 g (0.7 percent) of cadmium oxalate particle size of not more than 0.125 mm and poured under stirring 45,0 g (45,0%) orthophosphoric acid brand "h" GOST 6552. The resulting mixture was homogenized.

In another Cup fall asleep 0.8 g (0,8%) of powder sodium lignosulfonates TU-13-0281-036-90, dissolve them in 23,0 g (23,0%) water GOST 2874, and then pour the resulting solution of lignosulfonate in the glass with a mixture of graphite, cadmium oxalate and orthophos XG is eroge color with metallic luster and density 1,588-1,593 g/cm3.

Other compositions are prepared in the same way.

For testing, the results of which are presented in the table, was taken from a well known drug and offer.

Testing is carried out as follows. On a rusty steel plate size 50 x 100 mm with a thickness of rust to 150 μm brush cause is known and the proposed rust converters. On the part of the plate in advance of the brush put mineral oil or fuel oil. When applying the known Converter on these plates is rolling into balls, which at the location of the plates vertically poured from the surface. This is due to the absence in the composition of surface-active substances, whose role in the proposed composition perform lignosulfonates.

When applying the proposed Converter rust it is mixed with oil contamination, forming due to the emulsifying component homogeneous emulsion of oil-in-water". Oil, until this adsorbed layer of rust, goes into the Converter, and converts the rust component composition - orthophosphoric acid - free interacts with rust, converting it into an inert product.

The samples coated with noroi sulfate-reducing bacteria, and incubated for four months in the conditions most conducive to their reproduction (increased temperature and humidity, lack of air, the presence of nutrient medium).

After four months, the samples are removed from the ground and inspected. On samples with known rust under black tubercles iron sulfide found ulcers in metal; under the proposed Converter rust is missing.

Oxalate cadmium receive as a result of the exchange reaction between oxalic acid - N2WITH2O42 H2About the brand "h" GOST 22180-76 and chloride cadmium - CdCl22,5 H2O mark "h" GOST 4330-76:

CdCl2+H2WITH2O4=CdC2O4+2 Hcl.

At the confluence of the solutions of cadmium chloride and oxalic acid, the amount of which is calculated by the reaction, and their vigorous stirring slowly precipitation of cadmium oxalate. After complete precipitation suspension is filtered on a Buechner funnel in the suction flask connected to a vacuum pump. The precipitate washed five times with distilled water from hydrochloric acid to neutral pH in the filtrate and dried at room temperature to constant weight.

When the content of the rust Converter graphite less 27,0% is lowering its viscosity, and when applying it spreads over the surface, decreasing its opacity.

When the content of graphite more than 34.0% of the drug to become viscous and rigid, loses its plasticity, which makes its application to the metal surface.

When the content of the rust with phosphoric acid less 43,0% decreases its transforming ability and flexibility.

When the content of phosphoric acid is more 51,0% decreases the viscosity of rust and deterioration of its coverage.

When the content lignosulfonates less than 0.5% worsen its emulsifying properties.

The content of the lignosulfonate more than 1.1% does not increase emulsifying properties of rust Converter, and only leads to irrational consumption.

Reducing the water content below 20,0% causes the composition to become "hard", ill be applied to a surface is t to increase the porosity of the coating and reduce the opacity.

The decrease in the concentration of cadmium oxalate lower than 0.4% leads to deterioration of its bactericidal properties.

The increase in the content of cadmium oxalate more than 1.0% leads to excessive reagent.

In addition to the ability detrimental impact on SSC and to prevent hydrogen sulfide corrosion, the product removes rust, covered with fat and oil pollution, has inhibitory ability, i.e. the ability to inhibit the corrosion process under normal conditions and at elevated temperatures - reducing properties. The proposed rust Converter can be operated in the temperature range from minus 30oWith up to 500oS at the temperature of application is from minus 30oWith up to 60oC. At the operating temperature of 150-170oThe proposed Converter does not require overlap of paint material, because under these conditions it happen irreversible chemical and structural changes that increase strength.

This rust Converter can be applied in various sectors of the economy: oil and gas, shipbuilding, agriculture, etc.

The rust Converter, including orthophosphoric the following ratio of ingredients, wt. %:

Phosphoric acid - 43,0 - 51,0

Graphite - 27,0 - 34,0

Oxalate cadmium - 0,4 - 1,0

The lignosulfonate - 0,5 - 1,1

Water - The Rest

 

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