Effect of Weld and Surface Defects on the Corrosion Behavior of Nickel Aluminum Bronze in 3.5% NaCl Solution

Abstract

To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.

Cavitation of some copper alloys for naval propellers: electrolyte effect

“…ABW turned out to create a strong additional corrosive effect to the mechanical cavitation damaging. This may be related to its content of sulfidic species, which is well known to act detrimental on copper and its alloys by retarding the formation of the regular, copper oxide-based protective layer [2,16]. Moreover, the corrosion products on the surface may have influenced the further nucleation of impacts, resulting in a significant change in the damaging pattern, particularly for NAB and brass (Figure 7b, c).…”

“…The attempt to achieve greater efficiency of systems and navigation, resulting in the design of larger propellers operating at higher revolutions, increases the likelihood of cavitation and in combination with the corrosive environment the potential for damages due to this phenomenon has increased [1]. In particular, considering the need to extend the service life of propellers, to save material and manufacturing costs, to extend the operating regime, etc., an exhaustive study of cavitation is required for design optimization [2], [3], [4]. Moreover, environmental conditions must be taken into account, as they can cause corrosion problems and aggravate the phenomenon of cavitation, while, on the other hand, cavitation may also accelerate IOP Publishing doi:10.1088/1757-899X/1288/1/012056 2 the corrosion processes.…”

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

“…These findings were further supported by EIS data. 90 In contrast, another research study 91 reported that weld-repaired NAB alloy exhibited inferior corrosion resistance compared to as-cast alloy. This behavior was ascribed to the inhomogeneous microstructure of the weld-repaired sample, which resulted in an uneven and less adherent corrosion product film with higher internal stress, making it more prone to be easily removed.…”

“…This behavior was ascribed to the inhomogeneous microstructure of the weld-repaired sample, which resulted in an uneven and less adherent corrosion product film with higher internal stress, making it more prone to be easily removed. 91…”

“…This behavior was ascribed to the inhomogeneous microstructure of the weldrepaired sample, which resulted in an uneven and less adherent corrosion product film with higher internal stress, making it more prone to be easily removed. 91 Friction stir processing as a solid-state surface modification technique can also affect the corrosion behavior of NAB alloys. 92 Ni et al 93 compared the short-term and long-term corrosion responses of friction-stir processed (FSPed) and cast NAB alloys in 3.5 wt% NaCl.…”