Effect of sodium octanoate on the tribocorrosion behaviour of 5052 aluminium alloy

Abstract

The 5000 series aluminium alloys are commonly used in a marine application where it is exposed to environments containing the chloride ions, which cause corrosion of aluminium alloy. The situation becomes even worse when aluminium alloys, in some situations, may suffer from combined corrosion and wear actions. The present study has been carried out to investigate the effect of sodium octanoate as a corrosion inhibitor on the corrosive wear behaviour of aluminium alloy 5052 in 0.5 M NaCl solution as simulated seawater. The effects of electrochemical potentials on the corrosive wear performance are also discussed.

Sulfide stress cracking inhibition of a supermartensitic stainless steel by using an imidazol obtained from palm oil

“…Therefore, the inhibitor molecules may have modified the electrochemical activity at the bottom of the pit, inhibiting electrochemical reactions that can occur within the pit. Finally, in some studies (Hong et al , 2016; Zhao et al , 2018), it has been reported that a higher concentration of inhibitor can cause pitting corrosion. In the present case of the Gemini surfactant, it can be explained by the desorption of inhibitor molecules and the formation of aggregated micelles in the solution when the concentration is far above the CMC.…”

A Review on Tribocorrosion Behavior of Aluminum Alloys: From Fundamental Mechanisms to Alloy Design Strategies

“…(2) The corrosion testing parameters, such as applied current/potential [56], corrosion inhibitor [57,58], and electrolyte composition [59,60]; and (3) The wear testing parameters, such as applied load [59,61] and speed [61,62]. For the material parameter effects, Ferreira et al [50] investigated the effects of spatial distribution of reinforcing particles (e.g., Al 3 Ti and Al 3 Zr) on the tribocorrosion resistance of Al-5 wt.% Ti and Al-5 wt.% Zr in 0.6 M NaCl solution.…”

“…Specifically, as shown in Figure 2a, the pure wear loss (V M0 in Figure 2a) remained relatively constant, while V C , the total material loss caused by pure corrosion, and ∆V M , the corrosioninduced wear, became increasingly larger at the more anodic potentials. The presence of corrosion inhibitor [57,58] and electrolyte composition [59,60] also affects the overall tribocorrosion rate. Corrosion inhibitors such as sodium octanoate [57] and zinc phosphate [58] were found to reduce tribocorrosion rate of Al alloys in NaCl solutions due to the formation of a surface barrier that not only limit mass and charge transfer to reduce corrosion, but also lowers surface friction to reduce wear.…”

“…The presence of corrosion inhibitor [57,58] and electrolyte composition [59,60] also affects the overall tribocorrosion rate. Corrosion inhibitors such as sodium octanoate [57] and zinc phosphate [58] were found to reduce tribocorrosion rate of Al alloys in NaCl solutions due to the formation of a surface barrier that not only limit mass and charge transfer to reduce corrosion, but also lowers surface friction to reduce wear. Liu et al [60] showed that the tribocorrosion rate of 7075-T6 Al alloy is higher in seawater than deionized water and ethanal.…”