Investigation of the corrosion behavior of aluminum bronze alloy in alkaline environment

Abstract

In this study, the effect of amino‐based additives including ammonia, ethanolamine and a mixture of two additives on the pH change of condenser water and corrosion behavior of aluminum bronze alloy as a structural material of condenser were investigated. The results of polarization curves, wheel tests and inductively coupled plasma showed that by increasing the pH from 8.5 to 10.5, the corrosion rate of aluminum bronze alloy and the dissolution rate of alloying elements are increased. The effect of amino‐based additives at the same pH is similar to each other. A comparison of corrosion rates determined by polarization curves. The corrosion rates for solutions contained ammonia and ethanolamine additives at pH = 10.5, were 2.92 ⋅ 10−2 and 4.55 ⋅ 10−2 mm/y respectively. The wheel test results indicated that the corrosion rates of solutions containing different additives increased to 1.1028 mm/y and 0.4504 mm/y for solutions containing ammonia and ethanolamine, respectively. Therefore, due to similar environmental conditions in the condenser and the wheel test because of the presence perturbation and biphasic fluid, it can be concluded that at pH above 10, aluminum bronze alloy has lower corrosion rate in the cooling water containing ethanolamine than ammonia additives.

Enhancement of resource recovery from retired tires: Extraction of copper and zinc resources

“…3a, but active behavior is observed in ammonia systems, implying that anodic active dissolution occurs. This demonstrates that the concentration of ammonia used for this work is appropriate, in contrast to the passivation behavior caused by low concentrations that has been discussed in the literature [38,39]. The corrosion current density (i corr ), polarization resistance (R p ), corrosion rate (CR), and anodic/cathodic Tafel slopes (β and β c , respectively) are calculated and listed in Table S1.…”

A review of the corrosion behavior of conventional and additively manufactured nickel–aluminum bronze (NAB) alloys: current status and future challenges

“…Electrolytes are also a decisive factor influencing the corrosion of NAB alloys. For instance, sulfide-polluted corrosive medium, 114 increased temperature, 86 higher pH of alkaline media, 115 and time-dependent magnetic fields 116 have been reported to adversely affect the corrosion resistance of NAB alloys. However, the impact of flow rate on corrosion rate remains uncertain, 86,113 as it depends on the solution type and its properties.…”

“…The corrosion characteristics of NAB were assessed in various alkaline solutions of ammonia, ethanolamine, and a mixture of ammonia + ethanolamine in different ratios. 115 It was observed that an increase in pH value had an adverse impact on the corrosion performance of the alloy. Specifically, pH values exceeding 10 resulted in a significant increase in corrosion rate, mainly due to the higher solubility of the alumina film under such experimental conditions.…”

“…Specifically, pH values exceeding 10 resulted in a significant increase in corrosion rate, mainly due to the higher solubility of the alumina film under such experimental conditions. 115 Apart from pH, the anodic polarization behavior of NAB was found to be affected by magnetic fields as well. 116 The application of a time-dependent magnetic field (TDMF) with increasing frequency resulted in higher joule heating caused by induced-eddy currents in the alloy, which accelerated the anodic reactions on the surface.…”