Validation and Optimization of an in-situ Copper-Modified Glassy Carbon Electrode

Abstract

Square wave anodic stripping voltammetry (SWASV) technique is one of the most used electrochemical techniques in the determination of the trace amounts of heavy metals in different environments. This is due among other reasons to the fact that this method offers low detection limit, high selectivity and precision at relatively low cost. Modified film electrodes have been found as good replacement to the mercury electrodes. In this work different deposition potentials have been used to optimize an in situ-prepared copper-film glassy carbon electrode (CuFE). In addition, a preliminary study using electrochemical impedance spectroscopy (EIS) was performed to investigate the characteristics of the CuFE sensor.

Tannin of Acacia mearnsii as green corrosion inhibitor for AA7075‐T6 alluminum alloy in acidic medium

“…The high corrosion resistance of aluminum and its alloys is credited to the formation of a passive oxide film (Al 2 O 3 ) on the surface, which is thin, compact, and adherent. This film is amphoteric and can suffer localized attack when the aluminum is exposed to acid or alkaline solutions and as well as in solutions with the presence of chlorides . Hydrochloride acid is very often used to clean the aluminum surface before some industrial processes, such as hot‐dip coating or electroplating, in order to remove scales and dust, but it can cause severe corrosion .…”

“…This film is amphoteric and can suffer localized attack when the aluminum is exposed to acid or alkaline solutions and as well as in solutions with the presence of chlorides . Hydrochloride acid is very often used to clean the aluminum surface before some industrial processes, such as hot‐dip coating or electroplating, in order to remove scales and dust, but it can cause severe corrosion . Thus, the corrosion control in aluminum and aluminum alloys is very important for some practical applications in the industry .…”

“…Hydrochloride acid is very often used to clean the aluminum surface before some industrial processes, such as hot‐dip coating or electroplating, in order to remove scales and dust, but it can cause severe corrosion . Thus, the corrosion control in aluminum and aluminum alloys is very important for some practical applications in the industry . Many methods have been proposed for the aluminum corrosion control in different environments, such as anodizing, coatings, and the use of inhibitors.…”

“…The inhibitors are substances from inorganic or organic nature that when added in small amounts can significantly retard the corrosion. This form of corrosion control has been frequently applied in the industry because the addition of the inhibitor can be done without interruption of the process, which makes this practice particularly advantageous …”

Corrosion behaviour of cold‐rolled aluminium AA8015‐alloy in natural seawater at 0.18 μm surface roughness

“…It is confirmed that 2xxx, 5xxx and 7xxx aluminium alloys are susceptible to stress-corrosion cracking [5]. Moreover, evidence of corrosion in aluminium is confirmed [6]. Further scholarly articles Open circuit potential E oc À0.713 À0.723 À0.703 reported also indicate that aluminium and its alloys corrode, despite its formation of a natural oxide layer that is chemically inert [7][8][9][10][11][12][13][14][15][16].…”