For the selection of paints with the group of companies “IPC” together with the privately held company “of TsNIIMF” was carried out the work on putting of the number of paints in the sections of the ballast tank of the exploiting dock on by Novorossisk ship-repair plant.

1. Surface preparation before the dyeing

Tests were carried out before onboard ballast tank of the exploiting dock on by Novorossisk ship-repair plant before the period July - October 2002. Dock is built at the shipyard “[I].[L].[Mosor]” g. Of [trigor], Yugoslavia. Housing of steel. It is painted with the building for the sake of the epoxy enamel of firm “Vettewinkel”. It was not produced based on the moment of building inside the tank of repair and coloring works.

Entire surface of tank is covered for the sake of the layer of the products of corrosion. Rust is laminar with thickness from 300 to 1500 m. The thickness of the layer of rust was determined with the aid of the thickness gauge Of elcometer 456. The small sections of the preserved coating are observed beyond the surface. The initial surface condition of skin of tank, corresponds to the degree of rusting D on ISO 8501-1: 1988. Before the process of operation on the bottom of tank the sea water constantly is located. Humidity inside the tank is high, which leads down a constant condensation of moisture beyond the surface of skin of tank. The temperature before the period of conducting tests was from 20 to 40°[S]. with sinking of dock, the ballast tank of 1-2 times is per month filled up for the sake of sea water, at the point of 6-8 hours.

Surface preparation before the dyeing was conducted with the aid of the water-jet cleaning of ultrahigh pressure. Was used installation “Hammelmann” of the type S -2500-16 with the operating pressure of 2400 bars. Cleaning was conducted by one jet pistol. For the cleaning was used fresh industrial water, whose composition corresponded to the demands of firm “Hammelmann”. Before the process of cleaning before the tank the forced ventilation was not conducted, natural ventilation practically was absent. The quality of cleaning was evaluated visually 10-15 minutes after the curtailment of the cleaning, when fog settled. Immediately after conducting of water-jet cleaning (5-10 min) the relative humidity of air composed 97,4%; the temperature of air - 34,4 °[S]; the temperature of metal - 35,8 [s]; t = 0,9. The cleaning was conducted repeatedly in some sections. The purified surface had matte gray painting without the tracks of rust, the surface of metal was wet. On the standards of cleaning firm “Hempel” the degree of cleaning corresponded Wj-2. The degree of the second corrosion at the beginning of coloring works composed FR -1.

Test with the aid of Scotch tape, recommended by firm “Hempel”, did not record the presence of the fragile connected rust.

The roughness of the purified surface was determined with the aid of the sensor of the gauge of roughness with the range R z, m - was 2nd 600 on the standard ISO 2808 and it was from 20 to 100 m.

2. Selection of systems [LKP]

For the full-scale tests of the systems for protection of ballast tanks from corrosion the producers of ship coatings proposed [LKM], which allow their putting by means of the surface, prepared with the aid of the water-jet installation of the ultrahigh pressure, which are brought down the moist surface.

The selection of domestic [LKP] for the protection of ballast tanks from the corrosion with the use of water-jet cleaning of ultrahigh pressure was achieved on the following conditions:

• the base coat of system allows putting by means of the moist surface or by means of the dry surface, covered for the sake of the layer of second rust;
• before the process of the drying of all layers [LKP] is allowed the humidity of air 80- 85%.

Material for the tests - enamel [SBE]-111 “Of [unipol]” stamp B, red-brown colors - and documentation granted together with other firms of privately held company [NPK] “[Korrzashchita]”.

The system of the paint and varnish coat, proposed as far as the privately held company [NPK] “Of [korrzashchita]”, is given before Table 1.

With the analysis of the recommendations of producer [LKM] up the surface preparation of steel constructions before the dyeing causes difficulty the absence of general approach to the requirements opposite the surface condition with the use of water-jet cleaning over the high pressure. Due to these conditions the surface of metal can be characterized as wet (presence of the seen for the sake of eye film of moisture); moist (presence of the adsorptive film of water, not seen for the sake of eye) and damp (beyond the apparently dry surface it is possible the condensation of moisture t to At of >3°[S]).

Table of №1. the paints, which entered the tests (recommendations of producer)

the Firm- producer	[Naimen]. the material	Basis	Climatic conditions for the putting				Quantity of the layers
			The degree of surface preparation. on NaCE PS/SSPC-SP12	Min. of t°C	[Vlazhn]. (Delta t)	Characteristic of the humidity of the surface
Privately held company [NPK] “Of [korrzashchita]”	Enamel [SBE]-111 “Of [unipol]”	Natural rubber- resin [modif].	WJ-3	-15	98%	moist	2 (80)

3. Procedure of the coloring works

On July 12 surface was purified and substituted the enamel [SBE]-111 “Of [unipol]”.

Climatic conditions before the process of putting are given before Table 2.

Enamel was brought by the method of airless dispersion with the aid of the installation “King” of firm “Graco”. For mixing the paint it was used the agitator of firm “Wiwa”.

As can be seen from given, given before Table 2, the application of paint and varnish coats was conducted before critical about the temperature and humidity conditions.

Before the process of putting was controlled the thickness of moist film with the aid of hexahedral comb 112 with the range of thicknesses 25 - 3000 m.

Table of №2. the climatic conditions for the putting

Designation [LKM]	Relative humidity of air, %	Temperature of °[S]		Difference between the point of dew and tempera the fucoid of the surface
		the surface	air
Enamel [SBE]-111 “Of [unipol]”	75,8	32,5	31,9	4,0

  The time of drying enamel was controlled about the recommendations of producer. The thickness of coating was determined after the end of coloring works. Thickness was determined with the aid of the thickness gauge Of elcometer 456 with the range of thicknesses 0 - 1500 m. In the section of coating it was carried out 8-10 measurements, the extreme values were rejected, rest were averaged. Table 3 depicts the averaged thickness of coating.

4. Procedure of tests and the results of the inspection

Its longevity is fundamental characteristic with the selection of the system of protective coatings. Longevity - period of the service of coating to the first complete repair dyeing. The complete repair dyeing of ballast tanks is required, when coating state is evaluated as poor: the general destruction of coating down 20% of area or deep corrosive destruction down 10% of the area in question.

The definition of longevity is carried out both due to the actual conditions and by the accelerated way. The shielding ability of coatings is evaluated by the direct and indirect methods:

• the direct methods: the visual estimation of coating state;
• the indirect methods: the measurement of adhesion, porosity, water and ion permeability and water absorption.

The following methods were used for accelerating obtaining tentative results about the longevity of coatings:

• putting coating systems with the reduced quantity of layers in comparison with the recommendations of producers;
• the disturbance of the continuity of the coating by putting the cut.

Table of №3. the actual thickness of the tested coating

Coating system	Overall thickness, m. (quantity of layers)
Enamel [SBE]-111 “Of [unipol]”	180 (2)

 Cleaning was carried out by sea water.

Operating conditions before the ballast tank in accordance with the classification of recommended ISO - 12944 “varnishes and of paint - corrosion protection of steel constructions as far as the systems of protective coatings” should be considered as immersed before the sea water. Three different zones of immersion beside the water are characteristic for the skin of tank:

• the zone of complete sinking - bottom and the lower vertical part of the skin of tank;
• the zone of variable moistening - middle part of the vertical skin of tank, beyond which the water level changes periodically;
• the zone of spattering - deckheads and the upper part of the vertical skin, sprinkled by sea water, this part of the surface of tank is characterized as far as the most significant corrosive destruction.

The painted sections were arranged in the zone of variable moistening and in the zone of spattering.

The first inspection of the corrosive state of coatings was conducted in three months.

With the inspection was conducted visual monitoring of the general state of coatings in accordance with ISO 4628 “varnishes and paint. Estimation of the destruction of paint and varnish coats. Determination of intensity, quantity and sizes of standard defects”.

Inspection was conducted regarding the degree of the formation: bubbles, corrosion, splitting, exfoliation and chalking. Before the process of inspection the state of the cuts, substituted on the coatings, was controlled.

Coating on the basis of the enamel [SBE]-111 “Of [unipol]” showed high durability with the tests and possibility of their putting with the water-jet surface preparation of steel with the initial state D (ISO 8501: 1).

The obtained results showed that with the water-jet cleaning of ultrahigh pressure can be used priming enamel [SBE]-111 “Of [unipol]”.

The obtained coating was characterized grow prettier by adhesion and high durability with the tests due to the conditions for a constant condensation; the duration of tests makes it possible to forecast the tentative period of the service of coating - 5-6 years.

The senior scientific worker
the sector of the protection of vessels from the corrosion Markovich [R].[A].