Effect of corrosivity on environment on the residual corrosion rate of steel in the specified range of protective potentials
DOI:
https://doi.org/10.31471/1993-9965-2020-1(48)-7-15Keywords:
carbon steel, protective polarization potential, cathodic protection, residual corrosion rate, corrosive environment.Abstract
Studies’ results of the effect of environment’s corrosivity on residual corrosion of carbon steel in specified by DSTU 4219 range of protective potentials is presented. It is shown that this index depends on a number of factors – the polarization potential, the duration of the test and pH. It was demonstrated the decreasing of residual corrosion rate with increasing (in absolute value) of protection potential for environments with pH in the range from 5.6 to 9.6. It is shown that under the same protective potential for 8 hours in these environments, the residual corrosion rate of steel is different. At a minimum potential of -0.75 V in the environment with low acidic and strongly alkaline pH (5.6 and 9.6, respectively) the protective effect (i.e. a decrease of the corrosion rate to the values less than 0.01 mm/year) not achieved. The minimum values of corrosion rates, which are setting are 0,021 0,040 mm/year, and the conditions for the flying of local corrosion can create. In slightly alkaline environment (pH of 8.2) the protective effect achieved at the potential -0,72 V, and minimum protective potential the cathodic protection is effective. With the increase of the duration of investigations up to 1 month in all environments the protective effect achieved at the minimum protection potential, and under it increasing (in absolute value) decomposition of an aqueous solution, accompanied by hydrogen recovery. The rate of residual corrosion in solutions with different pH varies with time: through a short test time (near 8 hours) decreases nonlinearly with increasing the test time (up to 1 month) – a complex dependence on the potential with the minimum values in the area of alkaline pH is observed.
Downloads
References
Electrochemical study of the corrosion rate of carbon steel in soil: Evolution with time and determination of residual corrosion rates under cathodic protection / Barbalat M., Lanarde L., Caron D., Meyer M., Vittonato J., Castillon F., Fontaine S., Refait Ph. Corrosion Science. 2012. Vol. 55. P. 246-253. URL: https://doi.org/10.1016/j.corsci.2011.10.031
Barbalat M., Caron D., Lanarde L., Meyer M., Fontaine S., Castillon F., Vittonato J., Refait Ph. Estimation of residual corrosion rates of steel under cathodic protection in soils via voltammetry. Corrosion Science. 2013. Vol. 73. Р. 222–229. URL: https://doi.org/10.1016/j.corsci.2013.03.038
NACE SP0169-2007 (formerly RP0169) Parts incorporated in pipeline safety regulations Control of External Corrosion on Underground or Submerged Metallic Piping Systems. URL: https://store.nace.org/sp0169-2007-formerly-rp0169-
Strizhevskiy I. V., Belogolovskiy A. D., Dmitriev V. I. i dr. Zaschita podzemnyih metallicheskih sooruzheniy ot korrozii: Spravochnik. M.: Stroyizdat, 1990. 303 p. [in Russian].
Medvedeva M. L., Muradov A. V., Pryigaev A. K. Korroziya i zaschita magistralnyih truboprovodov i rezervuarov: Uchebnoe posobie dlya vuzov neftegazovogo profilya. M.: Izdatelskiy tsentr RGU nefti i gaza imeni I.M. Gubkina, 2013. 250 p. [in Russian]. URL: http://pb02.twirpx.net/1864/1864987_4B667B5F/medvedeva_m_l_muradov_a_v_prygaev_a_k_korroziya_i_zashchita.pdf
Podgornyiy A.A. Zaschita podzemnyih metallicheskih truboprovodov ot korrozii. K. : Budivelnik, 1988. 76 p. [in Russian].
Polutrenko M. S. Ekologichna bezpeka ekspluatatsii i magistralnih gazoprovodiv. Naftogazova galuz UkraYini. 2014. No 5. P. 45-48. [in Ukrainian]. URL: http://www.naftogaz.com/files/journal/5_2014_preview.pdf
Influence of soil moisture on the residual corrosion rates of buried carbon steel structures under cathodic protection / D. Nguyen Dang, L. Lanarde, M. Jeannin, R. Sabot, Ph. Refait. Electrochimica Acta. 2015. Vol. 176. P. 1410–1419. URL: https://doi.org/10.1016/j.electacta.2015.07.097
Jones D. A. Analysis of Cathodic Protection Criteria. Corrosion. 1972. Vol. 28(11). P. 421–423. URL: https://doi.org/10.5006/0010-9312-28.11.421
Peabody’s Control of pipeline corrosion / Edited by RONALD L. BIANCHETTI / Second edition. NACE International The Corrosion Society. 1440 South Creek Drive, Houston, Texas. 2001. P. 347. URL: https://www.academia.edu/21645437/CONTROL_OF_PIPELINE_CORROSION_SECOND_EDITION
Hizhnyakov V.I. Razvitie nauchnyih osnov, razrabotka i realizatsiya novyih kriteriev effektivnosti elektrohimicheskoy zaschityi truboprovodov ot korrozii. Diss. … dokt. tehn. nauk. 05.17.03. 2010.357 p. [in Russian].
Lubenskiy A.P., Lubenskiy S.A., Cheburahtin N.A., Antonov V.G. Lubenskiy. Sostav dlya provedeniya ispyitaniy na stoykost trubnyih staley k korrozionnomu rastreskivaniyu pod napryazheniem. Patent RF No 2082154. Zayavl. 12.07.1994. Opubl. 20.06.1997. [in Russian].
Szklarska-Smialowska K Z., Xia Z., Rebak R.B. Technical note: stress corrosion cracking of Х-52 carbon steel in dilute aqueous solutions. Corrosion. 1994. Vol.50. No. 5. Р.334–338. URL: https://doi.org/10.5006/1.3294341
Mekhanika ruinuvannia ta mitsnist materialiv : dovidkovyi posib. T. 11: Mitsnist i dovhovichnist naftohazovykh truboprovodiv i rezervuariv / H. M. Nykyforchyn, S. H. Poliakov, V. A. Chervatiuk ta in. Lviv : Spolom, 2009. 504 p.
Korroziya i zaschita metallov i oborudovaniya : metodicheskie ukazaniya / sost.: E.V.Shkolnikov, I.Ya. Kiselev. SPb.: SPbGLTU, 2014. 40 p. [in Russian].
Strizhevskiy I. V. Zaschita metallicheskih sooruzheniy ot korrozii. Spravochnik. Izd. 2-e. / Strizhevskiy I. V., Zinevich A. M., Nikolskiy K. K. i dr. M.: Nedra, 1981. 293p. [in Russian].
Shamshetdinova N. K. Povyishenie effektivnosti elektrohimicheskoy zaschityi magistralnyih gazoprovodov pri nalichii otsloeniy izolyatsionnogo pokryitiya. Avtoreferat dis. … kand. tehn. nauk : spets. 25.00.19; 05.17.03. 22 p. [in Russian]. URL: https://www.dissercat.com/content/povyshenie-effektivnosti-elektrokhimicheskoi-zashchity-magistralnykh-gazoprovodov-pri-nalich/read
Hizhnyakov V. I., Negodin A. V. Korrozionnoe rastreskivanie katodno zaschischaemyih gazonefteprovodov v protsesse dlitelnoy ekspluatatsii. Vestnik TGASU. 2017. No 4. P. 82-92. [in Russian]. URL: https://cyberleninka.ru/article/n/korrozionnoe-rastreskivanie-katodno-zaschischaemyh-gazonefteprovodov-v-protsesse-dlitelnoy-ekspluatatsii
Parkins R.N. Current Topics in Corrosion: Factors Influencing Stress Corrosion Crack Growth Kinetics. Corrosion. 1987. Vol. 43, № 3. P. 130–139. URL: https://doi.org/10.5006/1.3583125
GOST 9.502-82 Edinaya sistema zaschityi ot korrozii i stareniya. Ingibitoryi korrozii metallov dlya vodnyih sistem. Metodyi korrozionnyih ispyitaniy. 17р.
Downloads
Published
How to Cite
Issue
Section
License
Авторські права....
1.png)
1.png){kind=logo}
