INVESTIGATION INTO TUBULAR STRUCTURE FORMED BY PITTING CORROSION ON THE SURFACE OF CARBON STEEL

The acoustic emission (AE) technique was applied to monitor the pitting corrosion of carbon steel in NaHCO3 + NaCl solutions. The open circuit potential (OCP) measurement and corrosion morphology in-situ capturing using an optical microscope were conducted during AE monitoring. The corrosion micromorphology was characterized with a scanning electron microscope (SEM). The propagation behavior and AE features of natural pitting on carbon steel were investigated. After completion of the signal processing, including pre-treatment, shape preserving interpolation, and denoising, for raw AE waveforms, three types of AE signals were classified in the correlation diagrams of the new waveform parameters. Finally, a 2D pattern recognition method was established to calculate the similarity of different continuous AE graphics, which is quite effective to distinguish the localized corrosion from uniform corrosion.

Download Full-text

Feature Extraction of the Acoustic Emission Signals of Low Carbon Steel Pitting Corrosion Based on Independent Component Analysis and Wavelet Transform

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.373-375.677 ◽

2013 ◽

Vol 373-375 ◽

pp. 677-680

Author(s):

Wei Li ◽

Yu Li Gong ◽

Yang Yu

Keyword(s):

Acoustic Emission ◽

Carbon Steel ◽

Independent Component Analysis ◽

Pitting Corrosion ◽

Wavelet Transformation ◽

Low Carbon Steel ◽

Component Analysis ◽

Independent Component ◽

Low Carbon ◽

Ae Signals

Based on the characteristics of the acoustic emission (AE) signals from low carbon steel pitting corrosion, a new extraction method was proposed with wavelet transformation and independent component analysis. The experiment result shows that the new method can overcome the influence induced by the uncertainty of the independent source of low carbon steel pitting corrosion and good extraction result can be achieved.

Download Full-text

THE INHIBITION EFFECT OF ZINC AND SILICATE IONS ON PITTING CORROSION INDUCED BY CERIUM(III) IONS OF CARBON STEEL IN SODIUM CHLORIDE SOLUTION

Surface Review and Letters ◽

10.1142/s0218625x20500389 ◽

2020 ◽

pp. 2050038

Author(s):

QIONGWEI LI

Keyword(s):

Sodium Chloride ◽

Carbon Steel ◽

Pitting Corrosion ◽

Chloride Solution ◽

Sodium Chloride Solution ◽

Corrosion Potential ◽

In Situ Observation ◽

Inhibition Effect ◽

Synergistic Inhibition

Pitting corrosion of carbon steel in sodium chloride solution induced by Ce[Formula: see text] and the synergistic inhibition effects of Ce[Formula: see text] and Zn[Formula: see text]/SiO[Formula: see text] were investigated using in-situ observation and electrochemical methods. The results showed that the presence of Ce[Formula: see text] could result in severe pitting corrosion and a positive shift in the corrosion potential. It was found that individual Ce[Formula: see text], Zn[Formula: see text], or SiO[Formula: see text] had low inhibition efficiencies, whereas the combination of Ce[Formula: see text] and Zn[Formula: see text] or SiO[Formula: see text] proved to be highly effective in inhibiting the development of pits in two different ways and in enhancing the corrosion resistance. The pitting corrosion and inhibition mechanisms were discussed based on the results.

Download Full-text

Pitting Corrosion of Carbon Steel in Chloride-Containing Saturated Ca(OH)2 Solutions

Protection of Metals and Physical Chemistry of Surfaces ◽

10.1134/s2070205119010209 ◽

2019 ◽

Vol 55 (1) ◽

pp. 136-141

Author(s):

V. S. Shaldaev ◽

A. N. Malofeeva ◽

A. D. Davydov

Keyword(s):

Carbon Steel ◽

Pitting Corrosion

Download Full-text

Cluster Analysis of Acoustic Emission Signals During Carbon Steel Pitting Corrosion Process

Volume 1: Codes and Standards ◽

10.1115/pvp2014-28497 ◽

2014 ◽

Author(s):

Zhongzheng Zhang ◽

Cheng Ye ◽

Jun Jiang

Keyword(s):

Cluster Analysis ◽

Acoustic Emission ◽

Carbon Steel ◽

Ferric Chloride ◽

Pitting Corrosion ◽

Chloride Solution ◽

Ferric Chloride Solution ◽

Corrosion Process ◽

Different Types ◽

Ae Signals

In order to study acoustic emission (AE) signals characteristics of pitting corrosion on carbon steel, Pitting corrosion process on carbon steel in 6% ferric chloride solution was monitored by AE technology. K-mean cluster algorithm was used to classify the monitored AE signals, in which the duration, counts, amplitude, absolute energy and peak frequency were analyzed as the AE signals characteristics, and different types AE sources were identified. The results showed that there were mainly three type AE sources during carbon steel pitting corrosion process in ferric chloride solution, and the different types AE sources could be classified by cluster analysis. The research results have some certain significance for AE monitoring of pitting corrosion on carbon steel.

Download Full-text