ACADEMIC RESEARCH IN MODERN SCIENCE
International scientific-online conference
83
OBTAINING ANTI-CORROSION COATINGS FOR OIL PIPELINES
Bekberganova D.D.
Yuldasheva Kh.Sh.
Sapayeva S.G’.
https://doi.org/10.5281/zenodo.12705251
Abstract
- This article provides information on determining the optimal
composition of competitive coatings, as well as studying the effect of various
mineral substances and fillers on the composition of gossypol resin and
determining the physical and mechanical properties of a new type of coating.
The chemical composition, properties, and resistance to various environments
of the synthesized optimal composition are studied.
Key words:
corrosion, gossypol pitch, competitive coating, corrosion,
trunk pipes
INTRODUCTION
Oil and gas production is developing rapidly every year. In 1991, the rate
of production of gas condensate with oil in our republic was 2.9 million tons, and
by 1999, its rate exceeded 4 million tons. Gas production also grew rapidly, and
its production volume in 2002 was 1058.4 billion m3. Currently, the gas
production capacity is 67 billion m3. Delivery of these products to consumers is
mainly carried out through main oil and gas pipelines and gas networks. They
work under the influence of a corrosive active environment (soil electrolyte,
currents, bacteria). In such conditions, pipes can corrode and fail quickly. As a
result, as mentioned above, it causes great economic difficulties [1; b. 9-10].
To protect metal devices from corrosion, their materials are made of
special coating materials or insulating coatings are formed on their surface. But
the resulting insulation coatings wear out and break down over time. As a result,
moisture containing dissolved salts enters the metal, forms locally corrosive
galvanic elements on its surface, and causes corrosion of the object. Corrosion of
main pipelines causes huge economic losses. The cost of their production is
much higher than the cost of the metal used.
In this work, it is expected to comprehensively solve the problems of
efficient use of waste to obtain new modern composite coatings that protect
metals from aggressive environments for a long time by using gossypol tar, a
waste of the oil industry, various mineral fillers and other local raw materials.
Based on this, in the oil and gas sector, the production of means of corrosion
protection of metal constructions and transport equipment, ensuring their all-
round effect, improving their quality and reducing their cost are urgent issues.
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The analysis of the literature revealed that today the composition and
technologies of the anti-corrosion coating "Gossi-SM" based on cotton tar have
been developed, and such compositions are offered by mass. %: Bitumen BND
60/90-50-60, tar 15-20, low molecular polyethylene, oxyethyl fatty acids of
cotton tar as a plasticizer 10-15, wollostanite 5-10. This coating provides
optimal corrosion protection of metals by forming a film in an open
environment. In addition, it has long-term protection and anti-corrosion
properties of external surfaces of pipelines and other metal equipment,
including highly aggressive environments [2; b. 111-112].
The coating named "Asmol" has a high protective property and contains
sulfoacidic and neutral high-donor functional groups, it can resist any pressure
on pipes due to the presence of compounds that ensure the high activity of the
metal surfaces of the "Asmol" coating. At the same time, it leads to the slowing
down or complete cessation of the electrochemical corrosion process [3; p.34].
EXPERIMENTAL RESULTS
The purpose of the referenced scientific work is to create corrosion
protection coatings for oil and gas pipelines, constructions and facilities based
on oil industry waste and local raw materials. A number of priorities have been
identified to achieve this goal. In our many years of research to create
competitive coatings that protect main pipelines from aggressive environments,
we have succeeded in creating various composite coatings based on oil refinery
cubic residue-cotton tar.
Our preliminary studies were conducted on the effects of mineral and
vegetable fillers on gossypol resin at high temperatures (220oC) and the
interaction of components in different ratios. Later, lowering the temperature
(110-120 o C), we conducted research to determine the effects of H3BO3 in the
range of 0.5-1%. he formulations were prepared by mixing in a laboratory
multifunctional extruder. The adhesion of the resulting anti-corrosion coating
was studied. As a result of numerous studies, we managed to obtain coatings
that are resistant to acidic and alkaline environments. Test results are presented
in tables.
Table 1
Influence of the content of modifying additives on temperature
softening and penetration
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The same composition provides the best indicators characterizing the quality of the resulting coating. A slight deviation from the optimal content of additives sharply deteriorates the quality of the finished coating, and the absence of even one component
does
not
allow achieving the required coating condition.
Table 2
The results of determining the resistance of the coatings synthesized in
different proportions to acidic environments
№
Coatings
Initial
mass, g
Time, day
Protection
level, %
1
3
7
The mass of the
sample
change, g
H
Cl
H
NO
3
H
2
SO
4
For
acidic
environments
cover
5,56
5,48
5,24
5,52
5,45
5,16
5,47
5,41
5,11
5,44
1
98,5 98,3 98,4
2
For
alkaline
environments
cover
7,44
6,84
6,85
6,87
Protection
level, %
NaOH
97,4
№
Substances affecting gossypol resin
Melting
temperature,
℃
Needle
penetration
depth, mm
CaO
CH
4
N
2
O Rubber
powder
H
3
BO
3
1
0
0
0
0
36,7
210,6
2
0,5
0
0
0
38,4
190,8
3
1
0
0
0
42,3
182,8
4
1,5
0
0
0
47,6
173,4
5
2
0
0
0
49,9
164,2
6
2,5
0
0
0
52,4
152,2
7
3
0
0
0
55,3
141,1
8
3
0,5
0
0
58,7
132,5
9
3
1
0
0
60,9
116,7
10 3
1,5
0
0
63,8
100,4
11 3
2
0
0
66,4
85,1
12 3
2,5
0
0
70,5
70,4
13 3
3
0
0
73,7
55,5
14 3
3
0,5
0
77,6
40,5
15 3
3
1
0
80,9
30,1
16 3
3
1,5
0
88,7
18,3
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From the given results, it can be concluded that the heat and cold
tolerance and resistance to different environments of the obtained experimental
samples have increased, and we can see that the coating property has appeared.
The testing of this content was carried out according to the requirements
of the GOST 51164-98 standard. The obtained composition was tested in water,
3% NaCl solution, hydrochloric and sulfuric acid solutions. The results showed
that this composition can act as a new coating in protection against acid
corrosion.
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1.Хабибуллаев С.Ш., Абибуллаев Д.М., Махманов Ф. М., Бадриддинова
Металлар коррозияси ўқув қўлланма Тошкент — «Илм зиё» — 2016.
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полимеров
и
хлопковых
гудронов
для
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Абдразакович. – Казахстан., 2019.-111с.
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повышенной химической адгезией: автореф. Дисс. …док.тех.наук: 05.17.03/
Гладких Ирина Фаатовна. – Уфа., 2007.- 34 с.
