Anticorrosive addition agent for energetic unit cooling liquid

FIELD: anticorrosive agents.

SUBSTANCE: invention relates to agents used against corrosion in energetic units cooling systems. The proposed anticorrosive addition agent comprises the following components, g/l: sodium silicate, 0.12-0.48; sodium tetraborate, 0.10-0.60; sodium nitrite, 0.18-0.50; sodium hexameta-phosphate, 0.20-0.80; sodium carbonate, 1.20-1.50. Invention provides enhancing the anticorrosive resistance of energetic unit cooling systems.

EFFECT: improved and valuable properties of addition agent.

4 tbl, 1 dwg

 

The invention relates to corrosion protection of the cooling systems of power plants.

Known cooling liquid: RF patent №2027798 /similar/, U.S. patent No. 2815328 [1, 2], supplied in finished form, i.e. with a high water content.

To reduce transportation costs, it is advisable additive production of concentrates, when put into the water at the place of use, favorable technological conditions and saves transportation costs. This is especially true for Russia, with its extensive transport links.

Prior art attempts have been made to obtain additive-concentrate with high performance properties. Were proposed powders, pastes, liquid silicate nitrate, silicate-borate-based /not received distribution due to coagulation of industrially produced liquid silicate glass with module M=2,8-3,1, including analog/; chromates has not received a distribution from the philosophy of ecology; petroleum based discontinued due to formations of deposits on heat transfer surfaces.

It is well known that sodium silicates are very effective corrosion inhibitors of almost all metals. The ability to create an additive-concentrate in the most rational form /dry mix/ high exploitatio the governmental properties appeared after the creation of liquid glass /sodium silicate/ in powder form and module M=0,5-2,5 [3].

Low-modulus liquid glass in contrast to the medium and high modulus of liquid glass is not prone to coagulation in concentrated solutions and does not form a precipitate on heat transfer surfaces.

Production of liquid glass with any given module can be considered commercially available [3].

Also known is the high reactivity of hexametaphosphate in relation to ions of calcium and magnesium - base salts of hardness in fresh water. Introduction this component coagulates hardness salts, turning them into a gel, which does not stick to the heat transfer surface, and reduces their heat transfer capability. Moreover, the hexametaphosphate is a corrosion inhibitor for ferrous and non-ferrous metals [4].

In the presence of the flanges and non-metallic gaskets in the cooling system of possible crevice corrosion. To troubleshoot and correct common corrosion additive introduced sodium nitrite.

Sodium tetraborate is an inhibitor of ferrous and non-ferrous metals.

The technical result of the invention is to improve the corrosion resistance of the cooling systems of power plants.

To ensure operation of the corrosion inhibitor in an additive is injected alkali, increasing the pH to 8-10.

The proposed additive contains in the form of a powder the following components, g/l:

Sodium silicateof 0.12 to 0.48
Sodium tetraborate0,10-0,60
Sodium nitrite0,18-0,50
The sodium hexametaphosphate0,20-0,80
Sodium carbonate1,2-1,50

All the used inhibitors are water-soluble, so there is no possibility of formation of insulating sediment, sludge or scum. High protective effect at low weight content of inhibitors, the potential for significant dilution of the coolant water which reduces the labor costs for maintenance/ installation can be explained by the synergistic effect, when the formation of protective films involved a set of sodium salts.

Table 1 shows 3 options additives within the specified values, and table 2 shows the corrosion loss at test these options. Consideration should choose option 2, which, as follows from this table, reliably protects the metal below 0.1 g/m2d)required by GOST 28084-89. The use of option 1 is possible in malatestinic cases, and the use of option 3 - the most important structures.

During operation of the power plant normal leakage of cooling water, which requires periodic replacement level on mazdausa fluid. In power plants use the condensate /distrurbance water, but in some cases used for topping off and fresh water. Table 3 and 4 shows the corrosion loss steel /base metal/ when diluted coolant, using the condensate or fresh water, and figure 1 illustrates the permissible degree of dilution of the coolant water. From examination of tables 1 and 3 and schedule 1 should make the following conclusions:

1. Distilled water /condensate/ almost 3 times more corrosive than fresh water;

2. The proposed formulation additives permits during the operation of the dilution with distilled water 1:1, and the corrosion loss does not exceed the allowable;

3. The use of fresh water containing hardness salts, unlike the condensate leads to some improvement of quality protective film and its weight /dashed lines on the drawing/, but the constant use of hard water can lead to contamination of the cooling water. Introduction in the cooling system hard water should be considered as a valid exception, not the norm.

The proposed additive within 12 months were tested on the main engines of the fishing base "Grafton" in the Atlantic, which gave grounds to the Russian Register of shipping certificate to issue the PR is your batch No. 97.00604.184.

Thus, the task of obtaining powdery additives with high eksplutacionnymi properties. The additive composition comprises a water-soluble salts of sodium, each of which, as described above, creates the conditions under which protects from corrosion above the required level; also ensures neutralization of hardness salts in case of their occurrence in the water during its topping into the system; the composition of additives provides high anti-corrosive quality, allowing you to use the coolant until its dilution with water 1:1.

The additive is prepared by dry mixing the starting components in the mixer. To receive cooling fluid with the desired properties in the water introduced a number of components specified in the options table 1.

Sources of information

1. RF patent №2027796.

2. U.S. patent No. 2815328.

3. Valery A. Orlov. Conciliate coverage, M.: engineering, 1984.

4. Alcibia, Slevin. Corrosion inhibitors, M.: Chemistry, 1968.

Table 1

Variants of the additive composition, g/l
InhibitorsVarVarVar
Sodium silicate0,120,240,48
Tetraborate soda is I 0,100,400,60
Sodium nitrite0,180,330,50
The sodium hexametaphosphate0,200,600,80
Sodium carbonate1,201,351,50

Table 2

Corrosion tests according to GOST 28084-89 options table 1 at a temperature of 95°

MetalsCorrosionloss, g/m2day
VarVarVar
Cast iron0,00to-0.05-0,01
Steel-0,010,00+0,02
Brass-0,02-0,01-0,0O
Copper-0,030,00+0,01
Silumin-0,08-0,020,00
Solder-0,10to-0.05-0,08

Table 3

Corrosion loss began when diluted with distilled water coolant for option 2.

% dilution alkalinity, mEq/lPHcorrosion loss (g/m2day.
022,69,850,00
2018,29,783,81 10-2
4013,69,893,09 10-2
608,79,895,28 10-2
804,59,756,9 10-2
100-6,35to 8.41

Table 4

Corrosion loss began when diluted with fresh water coolant for option 2.

% dilutionalkalinity, mEq/lcorrosion loss (g/m2day.
027,8+0,05
2020,6+0,05
4016,4+0,1
6012,2+0,06
808,3-4,3
100a 4.9-2,97

Anti-corrosive additive, coolant, power plants, containing sodium silicate, sodium tetraborate, nitrite NAT the Oia, characterized in that it further contains sodium hexametaphosphate and sodium carbonate in the following ratio of components, g/l:

Sodium silicateof 0.12 to 0.48
Sodium tetraborate0,10-0,60
Sodium nitrite0,18-0,50
The sodium hexametaphosphate0,20-0,80
Sodium carbonate1,20-1,50



 

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