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Localized Corrosion Studied Via Interferometry Using Modified Surfaces

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Corrosion failures in the oil and gas industry are dominated by localized failures in carbon steel; however, the industry has yet to develop standards for localized corrosion specifically for low alloy carbon steels (CS) such as UNS K03014 (API) 5LX65 [X65]) or UNS G10180 (C1018). The reasons for the lack of standardization are understandable as they are not trivial. The challenges are as follows: 1) CS pitting is more complex than pitting on stainless steels (SS) and can be impacted by corrosion byproducts and other forms of scales, and 2) surface finish of a test coupon or electrode has a significant impact on the three phases of pitting: initiation, propagation, and termination.

Product Number: 51322-17747-SG
Author: Tracey Jackson, Haitao Fang, Jagrut Jani, Johnathon Brooks, Lei Huang
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings
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Localized corrosion in the oil industry is a dominant area of study that still remains elusive to researchers. Most infrastructure failures in the oil industry result from localized corrosion defects not general corrosion. Most corrosion testing relies on polished surfaces and relatively short tests resulting in detection of small features that may not be representative of field conditions. This paper looks at media blasted surfaces that are imaged at high resolution before and after corrosion testing. This method of corrosion testing shows that the modified surfaces contain populations of features that can be studied in aggregate to evaluate the effectiveness of corrosion inhibitors. This technique maximizes the utility of interferometry as a microscopy technique while also providing a surface that may be more representative of field conditions than a 600 grit polished surface.

Localized corrosion in the oil industry is a dominant area of study that still remains elusive to researchers. Most infrastructure failures in the oil industry result from localized corrosion defects not general corrosion. Most corrosion testing relies on polished surfaces and relatively short tests resulting in detection of small features that may not be representative of field conditions. This paper looks at media blasted surfaces that are imaged at high resolution before and after corrosion testing. This method of corrosion testing shows that the modified surfaces contain populations of features that can be studied in aggregate to evaluate the effectiveness of corrosion inhibitors. This technique maximizes the utility of interferometry as a microscopy technique while also providing a surface that may be more representative of field conditions than a 600 grit polished surface.

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