Research on the Corrosion Protection of Pipeline in Extremely Humid Environment

YANG Xingqian, ZHAO Shaoyong, ZOU Bo, ZHANG Wei, ZU Yunhe, XIE Fan, WANG Yang, TIAN Feng, ZHAN Wen

doi:10.16577/j.issn.1001-1560.2022.0341

Materials Protection >

2022 , Vol. 55 >Issue 12: 70 - 78

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0341

Research on the Corrosion Protection of Pipeline in Extremely Humid Environment

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(1. Silin Power Plant， Guizhou Wujiang Hydropower Development Co.， Ltd， Tongren 565102， China；2. State Key Laboratory of Special Surface Protection Materials and Application Technology，Wuhan Research Institute of Materials Protection， Wuhan 430030， China)

Received date: 2022-06-20

Revised date: 2022-08-10

Accepted date: 2022-09-14

Online published: 2023-12-27

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Abstract

Aiming at the situation of surface coating spalling of water pipeline in a hydropower plant in South China due to extremely humid operating environment， the corrosion mechanism of carbon steel pipelines and the influence of different impressed currents on the corrosion of pipelines under the combined action of impressed current cathodic protection and coating were studied by using the simulation experiment device with the application of both impressed current cathodic protection and coating. Results showed that at the initial stage of corrosion， the more negative the cathodic protection potential applied to the sample，the lower the corrosion rate of the sample. However，with the extension of the corrosion time， the corrosion rate of the sample at the normal cathodic protection potential (-1.20 V≤E≤-0.85 V) (vs SCE， the same below) was the lowest after 60 days of corrosion， and the excessively negative cathodic protection potential (≤-1.20 V) would cause cathodic stripping of the surface coating on the sample. In addition，under normal (-1.20 V≤E≤-0.85 V) and over-protection (≤-1.20 V) cathodic protection potential， the corrosion products of samples were relatively compact and flat. By contrast， under the conditions of no cathodic protection and under-protected cathodic protection potential (≥-0.85 V)， the corrosion products of the samples were fine and loose particles.

Key words： cathodic protection; potential; corrosion; coating; carbon steel; extremely humid

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YANG Xingqian, ZHAO Shaoyong, ZOU Bo, ZHANG Wei, ZU Yunhe, XIE Fan, WANG Yang, TIAN Feng, ZHAN Wen . Research on the Corrosion Protection of Pipeline in Extremely Humid Environment[J]. Materials Protection, 2022 , 55(12) : 70 -78 . DOI: 10.16577/j.issn.1001-1560.2022.0341

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