Dissolution Kinetics of α,β^′-Brass in Basic NaNO₃Solutions

Abstract

Corrosion tests at a constant anodic potential, referred to as dissolution tests, were performed to determine the dissolution kinetics of an α,β′-brass CuZn40Pb2 (CW617N) in a basic nitrate solution with and without mechanical loading. The corrosion behavior of the α,β′-brass was characterized by a two-step mechanism, with an initiation step for which the simultaneous dissolution of all the alloying elements of the β′ phase occurred only and a propagation step including at first, the afore-mentioned simultaneous dissolution process before a critical time tc and then, both simultaneous dissolution and dezincification of the β′ phase after tc. The pH and Cu concentration of the electrolyte near the brass surface were determined to be two of the major factors influencing the occurrence of the dezincification process. The dezincification of the β′ phase extended in depth by a percolation dissolution mechanism. Mechanical loading during the dissolution tests was observed to largely influence the dezincification process. It was assumed to open or close the pores present in the dezincified β′ phase, which promoted or slowed down the dezincification mechanism depending on the sign of the stress.

Corrosion Behavior of Aluminum Alloys in Different Alkaline Environments: Effect of Alloying Elements and Anodization Treatments

“…All the other tested alloys, such as Cu-based alloys (CW 617 N and Cu-Ni alloy), carbon steel (C40), and stainless-steel (AISI 304), show less negative E OCP values than all the aluminum alloys in E1, E2, and E3. Indeed, the less negative E OCP values are found for Cu-Ni alloy in E1 (−0.15 ± 0.04 V (SCE) ) and E2 (−0.03 ± 0.04 V (SCE) ) and for AISI 304 in E3 (−0.07 ± 0.04 V (SCE) ) [61][62][63][64]. Comparing the three galvanic series, it is possible to observe that the carbon steel (C40) specimen tested in E2 exhibited more negative values compared to the ones in E1 solution.…”

Sonochemical fabrication of gradient antibacterial materials based on Cu-Zn alloy

“…5 f-j). The SEM images demonstrate a significant cell surface disruption compared to a normal state [37] , [38] .…”

“…3 c–f) are attributed to Cu 2p 3/2 and Cu 2p 1/2 , respectively. The satellite peaks in a range of 943–944 eV indicate the presence of Cu + and Cu 2+ [36] , [37] .

Fig.

…”

Separation of motions and vibrational separation of fractions for biocide brass

“…A 5 µL droplet of the particle solution was incubated for 24 h at 37 °C in the grown lawn, and inhibition zone diameter was measured. The difference of inhibition zones correlated with various containing of copper ions [29] . All experiments were done in triplicate.…”