Investigation of properties of epoxy coating on X80 steelunder cathodic polarization conditions
DOI:
https://doi.org/10.62638/ZasMat1130Keywords:
epoxy coating, X80 steel, cathodic polarization, protective potential, cathodic disbondment, transient specific electrical resistance, coating degradationAbstract
The effect of cathodic polarization on the properties of the protective epoxy coating on X80 steel samples under cyclic changes in temperature from 20 to 75 оC over a period ~3.5 months was investigated. It is shown that in a 3% NaCl solution, with decreasing polarization potential from -1.05 to -0.85 V, the disbondment radius of the epoxy coating decreased by ~3.48 times (from 10.8 to 3.1 mm). At -0.75 V and in the absence of polarization, disbondment of the coating from the steel don’t observed. By potential -0.75 V coating retains its protective properties according to the transient specific electrical resistance indicator, and its aging is slowed down.
References
REFERENCES
DSTU 4219-2003 Main steel pipelines. General requirements for protection against corrosion. Kyiv. State Consumer Standard of Ukraine. 86 p. Change No. 1. 2018.
RP, N.S. (1969) Control of External Corrosion on Underground or Submerged Metallic Piping Systems. Mater. Prot., 8(9), 1.
J.A.Beavers, N.G.Thompson (2006) External corrosion of oil and natural gas pipelines. ASM handbook, 13 (05145),
https://doi.org/10.31399/asm.hb.v13c.a0004213
D.Hill et al. (2009) Performance of composite materials in corrosive conditions: cathodic disbondment of composite materials and modeling of a composite repair patch for pipelines. In NACE CORROSION (pp. NACE-09329). NACE. https://onepetro.org/NACECORR/proceedings-abstract/CORR09/All-CORR09/128711
Q.Ding et al. (2021) Influence of AC Stray Current on Cathodic Disbondment of Epoxy Coatings. International journal of electrochemical science, 16(1), 1-16,
https://doi.org/10.20964/2021.01.30
Jr.Leidheiser (1982) Corrosion of painted metals – a review. Corrosion, 38(7), 374-383,
https://doi.org/10.5006/1.3581899
N.Wint et al. (2020) Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel. Journal of The Electrochemical Society, 167(2), 021502. https://doi.org/10.1149/1945-7111/ab6289
M.Zamanzadeh (2016) March. Fusion Bonded Epoxy Coatings (FBE) and Disbondmen. In NACE CORROSION (pp. NACE-2016). NACE, https://onepetro.org/NACECORR/proceedings-abstract/CORR16/All-CORR16/123533
R.Ashari et al. (2020) Corrosion and electrochemical conditions of pipeline steel under tape coating disbondments: effect of disbondment gap size and morphology. Journal of pipeline systems engineering and practice, 11(1), 04019051, https://doi.org/10.1061/(ASCE)PS.1949-1204.0000413
C.Gu et al. (2020) The coating delamination mitigation of epoxy coatings by inhibiting the hydrogen evolution reaction. Progress in Organic Coatings, 147, 105774,
https://doi.org/10.1016/j.porgcoat.2020.105774
A.H.Mofidabadi. et al. (2020) Explorations of the adhesion and anti-corrosion properties of the epoxy coating on the carbon steel surface modified by Eu2O3 nanostructured film. Journal of Molecular Liquids, 314, 113658,
https://doi.org/10.1016/j.molliq.2020.113658
S.Akbarzadeh et al. (2020) Inspection the corrosion prevention performance and dry/wet interfacial adhesion qualities of the melamine-cured polyester coating applied on the treated mild steel surface with a nanostructured composite cerium-neodymium film. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 590, 124472, https://doi.org/10.1016/j.colsurfa.2020.124472
L.Zhang et al. (2014) The influence of cathodic polarization on performance of two epoxy coatings on steel. International Journal of Electrochemical Science, 9(11), pp.6266-6280,
https://doi.org/10.1016/S1452-3981(23)10887-X.
L.I.Nyrkova et all. (2020) Influence of the corrosiveness of a medium on the ratio of the cathodic protection current to the ultimate diffusion current for KH70 pipe steel. Materials Science, 56, 417-424, https://doi.org/10.1007/s11003-020-00445-7.
M.G.Fontana, R.W.Staehle, (1970) Advances in corrosion science and technology. Plenum Press.
