MD1495Z - Process for corrosion protection of steel in water - Google Patents
Process for corrosion protection of steel in water Download PDFInfo
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- MD1495Z MD1495Z MDS20200077A MDS20200077A MD1495Z MD 1495 Z MD1495 Z MD 1495Z MD S20200077 A MDS20200077 A MD S20200077A MD S20200077 A MDS20200077 A MD S20200077A MD 1495 Z MD1495 Z MD 1495Z
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- Moldova
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- corrosion
- water
- extract
- steel
- hours
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- 238000005260 corrosion Methods 0.000 title claims abstract description 37
- 230000007797 corrosion Effects 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 12
- 239000010959 steel Substances 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 7
- 240000001592 Amaranthus caudatus Species 0.000 claims abstract description 7
- 235000009328 Amaranthus caudatus Nutrition 0.000 claims abstract description 7
- 235000012735 amaranth Nutrition 0.000 claims abstract description 7
- 239000004178 amaranth Substances 0.000 claims abstract description 7
- 239000006286 aqueous extract Substances 0.000 claims abstract description 5
- 244000237956 Amaranthus retroflexus Species 0.000 claims abstract description 3
- 235000013479 Amaranthus retroflexus Nutrition 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 239000000284 extract Substances 0.000 abstract description 15
- 239000003112 inhibitor Substances 0.000 abstract description 9
- 244000025254 Cannabis sativa Species 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract description 2
- 230000005764 inhibitory process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 235000013399 edible fruits Nutrition 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 241000157282 Aesculus Species 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 235000010181 horse chestnut Nutrition 0.000 description 2
- 235000016068 Berberis vulgaris Nutrition 0.000 description 1
- 241000335053 Beta vulgaris Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241000219745 Lupinus Species 0.000 description 1
- 244000061458 Solanum melongena Species 0.000 description 1
- 235000002597 Solanum melongena Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000001484 Trigonella foenum graecum Nutrition 0.000 description 1
- 244000250129 Trigonella foenum graecum Species 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 235000001019 trigonella foenum-graecum Nutrition 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Filtering Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Invenţia se referă la domeniul protecţiei metalelor de coroziune în apă şi poate fi utilizată pentru a inhiba coroziunea în sistemele închise ale conductelor de oţel.Procedeul de protecţie a oţelului de coroziune în apă constă în introducerea în mediul coroziv a 10-30 ml/l de extract apos de amarant Amaranthus retroflexus L., obţinut prin extracţia ierbii uscate cu apă în raport de masă de 4:10 la temperatura de 70-90°C timp de 1-3 ore, cu filtrarea ulterioară.Rezultatul tehnic al invenţiei constă în sporirea rezistenţei la coroziune de până la 8,4 ori cu utilizarea unui inhibitor eficient şi ecologic inofensiv pe bază de extract apos de iarbă uscată de amarant.The invention relates to the field of protection of metals from corrosion in water and can be used to inhibit corrosion in closed systems of steel pipes. aqueous amaranth extract Amaranthus retroflexus L., obtained by extracting dry grass with water in a mass ratio of 4:10 at a temperature of 70-90 ° C for 1-3 hours, with subsequent filtration. The technical result of the invention consists in increasing corrosion resistance of up to 8.4 times with the use of an effective and environmentally friendly inhibitor based on aqueous extract of dried amaranth grass.
Description
Invenţia se referă la domeniul protecţiei metalelor de coroziune în apă şi poate fi utilizată pentru a inhiba coroziunea în sistemele închise ale conductelor de oţel. The invention relates to the field of protecting metals from corrosion in water and can be used to inhibit corrosion in closed steel pipeline systems.
Se ştie că apa naturală sau tehnologică, care conţine ioni de activare de clor şi de sulfat, este un mediu destul de agresiv, în care coroziunea oţelului se desfăşoară cu o viteză mare. Astfel, în Chişinău, pentru apa de la robinet, care conţine, mg/l: Ca2+ - 42,5, Mg2+ - 19,5, HCO3 - - 97,6, SO4 2- - 203,7, Cl- - 56,7, cu un conţinut total de sare de 0,457 g/l, viteza de coroziune a oţelului St. 3 la 8 ore de testare este foarte mare, ajungând la 21 g/m2·zi. Pe măsură ce timpul de expunere creşte, viteza de coroziune scade (de exemplu până la 4 g/m2·zi la 240 ore), datorită formării produselor de coroziune pe suprafaţa de corodare a filmului de peroxid-oxid. Cu toate acestea, peretele ţevii devine mai subţire şi, datorită prezenţei ionilor de clor în apă, se pot forma adâncituri pe suprafaţă care, în unele cazuri, pot deveni penetrante, ceea ce va conduce la o situaţie de urgenţă (Паршутин В. В., Шолтоян Н. С., Сидельникова С. П., Володина Г. Ф. Ингибирование бороглюконатом кальция коррозии углеродистой стали Ст. 3 в воде. Коррозия в условиях естественной аэрации и принудительной конвекции. Электронная обработка материалов, 1999, № 5, p. 42-56). It is known that natural or technological water, containing chlorine and sulfate activation ions, is a rather aggressive environment, in which steel corrosion proceeds at a high speed. Thus, in Chisinau, for tap water, which contains, mg/l: Ca2+ - 42.5, Mg2+ - 19.5, HCO3 - - 97.6, SO4 2- - 203.7, Cl- - 56.7, with a total salt content of 0.457 g/l, the corrosion rate of St. 3 steel at 8 hours of testing is very high, reaching 21 g/m2·day. As the exposure time increases, the corrosion rate decreases (for example, up to 4 g/m2·day at 240 hours), due to the formation of corrosion products on the corroding surface of the peroxide-oxide film. However, the pipe wall becomes thinner, and due to the presence of chlorine ions in the water, indentations can form on the surface, which in some cases can become penetrating, which will lead to an emergency situation (Паршутин В. В., Шолтоян Н. С., Сидельникова С. П., Володина Г. Ф. Ингибирование бороглюконатом калция корозии углеродистой стали Ст. 3 в воде. Коррозия в условия Natural ventilation and forced convection. Electronic processing of materials, 1999, № 5, p. 42-56).
Sunt cunoscuţi diferiţi inhibitori ai coroziunii, care reprezintă extracte din seminţe de schinduf, lupin, vânătă, sfeclă ş.a. [1]. Various corrosion inhibitors are known, which are extracts from fenugreek seeds, lupine, eggplant, beet, etc. [1].
Dar aceste extracte pot fi utilizate numai pentru inhibarea coroziunii în soluţii acide. În apă, care prezintă un mediu neutru, influenţa ei la diminuarea pierderilor de coroziune este nesemnificativă. Totodată metoda de extracţie utilizată nu permite extragerea tuturor substanţelor în soluţie, care pot inhiba coroziunea. But these extracts can only be used to inhibit corrosion in acidic solutions. In water, which is a neutral medium, their influence on reducing corrosion losses is insignificant. At the same time, the extraction method used does not allow the extraction of all substances in the solution that can inhibit corrosion.
Cea mai apropiată soluţie de invenţia propusă este procedeul de protecţie a oţelului împotriva coroziunii în apă cu ajutorul extractului apos din fructe de castan sălbatic, luat în cantitate de 50-150 ml/l de mediu coroziv [2]. Extractul se obţine astfel: la 300 g de fructe uscate şi fărâmiţate de castan sălbatic se adaugă 1 litru de apă distilată şi se fierbe 1…3 ore. După răcire, extractul se filtrează, apoi se adaugă în mediul coroziv. The closest solution to the proposed invention is the process of protecting steel against corrosion in water using an aqueous extract of horse chestnut fruits, taken in an amount of 50-150 ml/l of corrosive medium [2]. The extract is obtained as follows: to 300 g of dried and crushed horse chestnut fruits, add 1 liter of distilled water and boil for 1…3 hours. After cooling, the extract is filtered, then added to the corrosive medium.
Dezavantajul acestei soluţii este complexitatea procesului de preparare a extractului (uscarea, fărâmiţarea fructelor), cantitatea mică de fructe pe teritoriul RM, necesitatea unei cantităţi mari de extract pentru inhibarea maximă a procesului de coroziune. The disadvantage of this solution is the complexity of the extract preparation process (drying, crushing the fruits), the small quantity of fruits on the territory of the Republic of Moldova, the need for a large quantity of extract for maximum inhibition of the corrosion process.
Problema pe care o rezolvă invenţia constă în creşterea nivelului de rezistenţă la coroziune a sistemelor închise de conducte din oţel cu utilizarea unui inhibitor ecologic inofensiv pe bază de materie primă vegetală disponibilă. The problem solved by the invention consists in increasing the level of corrosion resistance of closed steel pipeline systems with the use of an ecologically harmless inhibitor based on available vegetable raw material.
Problema trasată se realizează prin procedeul de protecţie a oţelului de coroziune în apă, care constă în introducerea în mediul coroziv a 10-30 ml/l de extract apos de amarant Amaranthus retroflexus L., obţinut prin extracţia ierbii uscate cu apă în raport de masă de 4:10 la temperatura de 70-90°C timp de 1-3 ore, cu filtrarea ulterioară. The outlined problem is achieved through the process of protecting steel from corrosion in water, which consists of introducing into the corrosive environment 10-30 ml/l of aqueous extract of amaranth Amaranthus retroflexus L., obtained by extracting the dried herb with water in a mass ratio of 4:10 at a temperature of 70-90°C for 1-3 hours, with subsequent filtration.
Extractul se obţine astfel: 400 g de iarba uscată de amarant se adaugă la 1 l de apă distilată, se amesteca, şi este ţinută la o temperatură de 70-90°С timp de 1-3 ore. După răcire, extractul se filtrează, apoi se adaugă în mediul coroziv. The extract is obtained as follows: 400 g of dried amaranth grass is added to 1 l of distilled water, mixed, and kept at a temperature of 70-90°С for 1-3 hours. After cooling, the extract is filtered, then added to the corrosive medium.
Rezultatul tehnic al invenţiei constă în sporirea rezistenţei la coroziune de până la 8,4 ori cu utilizarea unui inhibitor eficient şi ecologic inofensiv pe bază de extract apos de iarbă uscată de amarant. The technical result of the invention consists in increasing corrosion resistance up to 8.4 times with the use of an efficient and ecologically harmless inhibitor based on aqueous extract of dried amaranth grass.
Testele la coroziune ale probelor cu dimensiunile de 50×25×3 mm au fost efectuate la imersia completă în soluţie la aceeaşi adâncime cu accesul aerului. Rugozitatea lor iniţială a fost stabilită prin şlefuire. Pierderile la coroziune au fost înregistrate gravimetric. Efectul de acţiune a inhibitorului a fost evaluat cantitativ prin viteza de coroziune k, g/m2·zi şi valoarea coeficientului de inhibare γ = k/k1, unde k1, k sunt vitezele de coroziune a metalului, respectiv cu şi fără utilizarea inhibitorului. Acest coeficient indică de câte ori viteza de coroziune se micşorează, ca urmare a acţiunii inhibitorului. Corrosion tests of samples with dimensions of 50×25×3 mm were carried out at full immersion in the solution at the same depth as the air access. Their initial roughness was established by grinding. Corrosion losses were recorded gravimetrically. The effect of the inhibitor action was quantitatively evaluated by the corrosion rate k, g/m2·day and the value of the inhibition coefficient γ = k/k1, where k1, k are the metal corrosion rates, respectively with and without the use of the inhibitor. This coefficient indicates how many times the corrosion rate decreases as a result of the inhibitor action.
Efectul concentraţiei inhibitorului şi a timpului de încercare asupra vitezei de coroziune k, g/m2·zi şi a coeficientului de inhibare γ este prezentat în tabel. The effect of inhibitor concentration and test time on the corrosion rate k, g/m2·day and the inhibition coefficient γ is presented in the table.
Din datele prezentate în tabel se observă, că cu cât mai mare este concentraţia inhibitorului şi timpul testării, cu atât mai mici sunt pierderile prin coroziune şi cu atât mai uniform în timp evoluează coroziunea oţelului în apă. From the data presented in the table, it can be seen that the higher the inhibitor concentration and the longer the testing time, the lower the corrosion losses and the more uniform the corrosion of steel in water evolves over time.
Limita superioară a concentraţiei extractului trebuie luată 30 ml pe litru de mediu coroziv, deoarece o concentraţie mai mare practic nu influenţează viteza de coroziune, ci duce la costuri ridicate. The upper limit of the extract concentration should be taken as 30 ml per liter of corrosive medium, because a higher concentration practically does not influence the corrosion rate, but leads to high costs.
Limita inferioară a concentraţiei extractului este de 10 ml pe litru de mediu coroziv, deoarece cu un conţinut mai scăzut de extract se observă o creştere a pierderilor cauzate de coroziune. The lower limit of the extract concentration is 10 ml per liter of corrosive medium, because with a lower extract content an increase in losses caused by corrosion is observed.
Tabel Table
Influenţa cantităţii de extract apos de amarant asupra The influence of the amount of aqueous amaranth extract on
parametrilor procesului coroziv al oţelului St. 3 în apă parameters of the corrosion process of St. 3 steel in water
Concentraţia extractului, ml/l Timpul testării, ore Viteza de coroziune, k, g/м2·zi Coeficientul de inhibare, γ 0 8 24 48 72 168 21,0 12,0 8,8 6,6 4,2 - - - - - 10 8 24 48 72 168 4,0 2,03 1,4 1,05 0,5 5,25 5,9 6,3 6,3 8,4 20 8 24 48 72 168 3,5 1,85 1,28 0,89 0,55 6,0 6,5 6,9 7,4 7,64 30 8 24 48 72 168 2,96 1,67 1,17 0,85 0,525 7,1 7,2 7,5 7,75 8,0Extract concentration, ml/l Testing time, hours Corrosion rate, k, g/m2·day Inhibition coefficient, γ 0 8 24 48 72 168 21.0 12.0 8.8 6.6 4.2 - - - - - 10 8 24 48 72 168 4.0 2.03 1.4 1.05 0.5 5.25 5.9 6.3 6.3 8.4 20 8 24 48 72 168 3.5 1.85 1.28 0.89 0.55 6.0 6.5 6.9 7.4 7.64 30 8 24 48 72 168 2.96 1.67 1.17 0.85 0.525 7.1 7.2 7.5 7.75 8.0
Procedeul propus este recomandat pentru inhibarea coroziunii în sistemele închise ale conductelor de oţel şi permite micşorarea vitezei de coroziune de până la 8,4 ori. The proposed process is recommended for inhibiting corrosion in closed steel pipeline systems and allows reducing the corrosion rate by up to 8.4 times.
1. Saleh R. M., Ismail A. A., Hosary A. A., Ингибирование коррозии экстрактами соединений. Экспресс-информация. Коррозия и защита от коррозии. М., 1985, nr. 1, p. 22-25 1. Saleh R. M., Ismail A. A., Hosary A. A., Inhibition of corrosion by extracts of compounds. Express information. Corrosion and corrosion protection. M., 1985, no. 1, p. 22-25
2. MD 3867 F1 2009.03.31 2. MD 3867 F1 2009.03.31
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MDS20200077A MD1495Z (en) | 2020-07-17 | 2020-07-17 | Process for corrosion protection of steel in water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MDS20200077A MD1495Z (en) | 2020-07-17 | 2020-07-17 | Process for corrosion protection of steel in water |
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| MD1495Y MD1495Y (en) | 2021-01-31 |
| MD1495Z true MD1495Z (en) | 2021-08-31 |
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| MDS20200077A MD1495Z (en) | 2020-07-17 | 2020-07-17 | Process for corrosion protection of steel in water |
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