Investigation of the corrosion process and destruction of metals by using acoustodamage method

D A Tretyakov ,Darya Strekalovskaya,Aliya R Galyautdinova ,Vladimir A Polyanskiy ,Аlexander K Belyaev

doi:10.1051/e3sconf/201912101017

Abstract

The paper presents the results of investigation of acoustic anisotropy in industrial alloy made of steel 14HGNDC after hydrogen-induced cracking (HIC) tests according to the standard NACE TM0284-2003. It was found that location and parameters of corrosion cracks with size about 20 microns can be determined by distribution and value of acoustic anisotropy. A quantitative relationship between value of acoustic anisotropy and size of corrosion cracks in the range from 60 to 6600 microns was established. The obtained results have a great importance for improving methods of hydrogen-induced cracking tests and for non-destructive testing of brittle destruction of structures in oil and gas industry by using the acoustodamage method.

Highlights

Corrosion and stress-corrosion processes occurring in structures made of high-strength steels are often accompanied by brittle destruction
The problem of detecting zones of corrosion cracking of oil tanks, oil and gas pipelines and structures operating in corrosive mediums and sea water on the base of the existing methods of non-destructive testing is difficult
It was found that change in the value of acoustic anisotropy during tests on hydrogen-induced cracking (HIC) of steel specimens made of 14HGNDC industrial alloy is observed even in case of absence of external loads and plastic deformations

Summary

Introduction

Corrosion and stress-corrosion processes occurring in structures made of high-strength steels are often accompanied by brittle destruction. The results of recent studies [1,2,3] indicate that initiation of cracking during external loading occurs in entire volume of the material due to micro- and nano- pores and cracks. The problem of detecting zones of corrosion cracking of oil tanks, oil and gas pipelines and structures operating in corrosive mediums and sea water on the base of the existing methods of non-destructive testing is difficult. The brittle failure of these structures is one of the main causes of accidents in oil and gas industry [4]

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Conclusion