Application of electrochemical noise to evaluate outdoor atmospheric corrosion of copper after relatively short exposure periods

Abstract

This study focused on the application of electrochemical noise to assess the protection level of corrosion products formed on copper during relatively short exposure time in different outdoor atmospheres. Electrochemical noise, cathodic reduction measurements and gravimetric (mass loss) analysis were applied to copper samples exposed at urban and rural/industrial areas in Cuba for 4 months. Measurements of Electrochemical current noise indicated that the poorest protective corrosion products were formed on samples exposed to atmospheres with high concentration of H 2 S which agreed with the corrosion rate determined by mass loss and electrochemical chronopotentiometry (cathodic reduction). The electrochemical noise methodology proposed in this work showed acceptable and reproducible results by using an electrochemical cell in which the electrolyte was formed by a distilledwater wetted cloth in contact with the compounds present on a corroded metallic surface. This methodology indicated that the corrosion protection level of the corrosion products formed on copper is related to the corrosivity of the atmosphere.

Sensing the Instant Corrosivity of Haze Using Electrochemical Probes by Electrochemical Noise Technique

“…It is generally accepted that EPN is related to the type of corrosion whereas ECN is associated with corrosion intensity. [41][42][43][44] This work aims to establish a suitable electrode system to study the corrosivity of haze and the effect of gaseous air pollutants and climatic parameters on the corrosivity. Two electrochemical probe was used to monitor the atmospheric corrosivity of Q235B and T91 steels.…”

Electrochemical investigation on atmospheric corrosion of carbon steel under different environmental parameters

“…EN was used as a novel and effective approach to study atmospheric corrosion as it can give information on the severity and morphology of the corrosion attack on metal surfaces as a function of time (García-Ochoa et al, 2008;Torres-Mendoza et al, 2006). However, EN data analysis and trend removal is still a challenging work due to direct current (DC) drift component in the EN signal (Homborg et al, 2007).…”

“…Atmospheric corrosion has been shown to be an electrochemical phenomenon under thin electrolyte films, so it is reasonable to consider electrochemical techniques for studying the process (Chung and Kim, 2000; Mansfeld et al , 1986). In the past, and for many years, electrochemical techniques have been developed to study the corrosion behavior of the metals covered by thin electrolyte films, to produce an atmospheric corrosion monitor (ACM) (Mansfeld et al , 1986; González et al , 1990; Mansfeld and Kenkel, 1976; Walter, 1991a, b; Sun et al , 2010; Cao et al , 2009), Kelvin probe technique (Stratmann and Streckel, 1990; Tahara and Kodama, 2000; Frankel et al , 2007), electrochemical impedance spectroscopy (EIS) (Shitanda et al , 2009; Nishikata et al , 1995; Silverman, 1993; Li et al , 2010), electrochemical noise (EN) (Torres‐Mendoza et al , 2006; Leban et al , 2001; García‐Ochoa et al , 2008; Wu et al , 2005), etc. The present studies bring more profound understanding of atmospheric corrosion of metals under thin electrolyte films and explore some new ways of monitoring the process.…”

“…The Kelvin probe technique (Stratmann and Streckel, 1990; Frankel et al , 2007) and EIS (Silverman, 1993; Li et al , 2010) are effective methods to explore the mechanism of atmospheric corrosion, but are difficult to use widely in different environments and countries because of their high cost, low applicability, complicated structure and difficulties in analyzing and understanding the collected data. EN was used as a novel and effective approach to study atmospheric corrosion as it can give information on the severity and morphology of the corrosion attack on metal surfaces as a function of time (García‐Ochoa et al , 2008; Torres‐Mendoza et al , 2006). However, EN data analysis and trend removal is still a challenging work due to direct current (DC) drift component in the EN signal (Homborg et al , 2007).…”

Electrochemical noise for corrosion detection

“…EN can be acquired with different experimental confi gurations; however, as a general rule, it works at open circuit potential condition without the need of an external polarization that could infl uence the electrochemical reactions. For this reason, EN is a real on-line, not perturbative, technique for corrosion monitoring and this feature makes it attractive to study corrosion phenomena ( Iannuzzi, Mendez, Avilla-Gray, Malo, & Rinc ó n, 2010 ;Nagiub & Mansfeld, 2001 ;Sarmiento Klapper, Goellner, & Heyn, 2010 ) and to monitor corrosion in industrial plants ( Garc í a-Ochoa et al, 2008 ;Gusmano, Montesperelli, Forte, Olzi, & Benedetti, 2005 ;Iverson & Heverly, 1986 ). EN has been successfully applied in the study of different forms of corrosion, such as pitting ( Gusmano, Montesperelli, & Montalto, 2001 ;Hill & Lillard, 2006 ;Sato, 1976 ), crevice ( Gusmano, Marchioni, & Montesperelli, 2000 ;Zeng, Luo, & Norton, 2004 ), stress corrosion cracking ( Shi, Song, Cao, Lin, & Lu, 2007 ) and microbiologically infl uenced corrosion ( Nagiub & Mansfeld, 2001 ;Padilla-Viveros, Garcia-Ochoa, & Alazard, 2006 ;Zaveri, Sun, Zufelt, Zhou, & Quan Chen, 2007 ), and in performance evaluation of coatings ( Gusmano et al, 2007 ) and inhibitors ( M é sz á ros, M é sz á ros, Pirn á t, & Lengyel, 1996 ;Tan, Bailey, & Kinsella, 1996 ).…”