Corrosion evaluation of welded nickel aluminum bronze and manganese aluminum bronze in synthetic sea water

Cobo, Ignacio; Biezma, M. V.; Linhardt, P.

doi:10.1002/maco.202213328

Cited by 9 publications

(3 citation statements)

References 35 publications

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“…The chemical composition of the materials was provided by the suppliers and is summarized in Table 1. Their hardness was assed previously [7] by 205 HB (NAB), 207 HB (MAB), and 158 HB for the brass. The specimens were machined to 20 x 15 mm with one corner rounded by a radius of ca.…”

Section: Methodsmentioning

confidence: 99%

Cavitation of some copper alloys for naval propellers: electrolyte effect

Biezma

Galván

Linhardt

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Efficient shipping is becoming more challenging, not only because of the increasing demand for this means of transport, the performance requirements and the optimisation of resources, but also because of the environmental constraints. Cavitation is a harmful phenomenon that can affect different systems of a ship such as pumps, valves, impellers, pipes, etc., but is particularly known for its effect on propellers, associated with loss of power and even impairment of structural integrity. The mechanical effect of cavitation on metallic materials is in general superimposed by corrosion and may thus lead to a synergistic degradation phenomenon. In this work, the cavitation behaviour and the potential synergistic effect with corrosion was evaluated for three widely used copper-based alloys, NAB (Nickel Aluminium Bronze), MAB (Manganese Aluminium Bronze), and a brass (low lead content) using three types of water: natural seawater, synthetic seawater and synthetic brackish water. Experiments were carried out in an ultrasonic bath, followed by structural surface characterisation. The main result is that MAB is most susceptible to both, general surface damage and deep localized attack. This is attributed to its poor ability in regenerating the protective layer, the area ratio of their phases and the high hardness of the κ-phase, in combination with high mechanical stresses during impacts affecting the grain boundaries. Moreover, natural seawater was found to increase cavitation, attributable to the dispersion of micro-particles, while brackish water with its content of sulfidic species was found to promote the strongest synergy between corrosion and cavitation.

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Section: Methodsmentioning

confidence: 99%

Cavitation of some copper alloys for naval propellers: electrolyte effect

Biezma

Galván

Linhardt

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Researchers have identified various problems in the past, including inadequate penetration, loss of strength, excessive distortion, and Heat Affected Zone (HAZ) cracks during fusion welding of these alloys [8,9]. Additionally, it is undesirable for martensite to develop at the weld zone due to the rapid cooling during the fusion welding of nickel aluminium bronze, as it induces brittle phase formation [10].…”

Section: Introductionmentioning

confidence: 99%

Role of oscillation frequency and amplitude on the microstructure and properties of linear friction welded nickel aluminium bronze joints

A K,

Selvam

et al. 2024

Phys. Scr.

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This study explores the influence of oscillation frequency and amplitude on the quality of linear friction welded joints using as-cast nickel aluminium bronze. Welding was conducted at 30 Hz, 50 Hz, and 70 Hz oscillated frequencies and amplitudes of 1.5 mm, 2 mm, and 3 mm. The joint’s performance was thoroughly investigated through systematic analysis, including macrostructure examination, peak interfacial temperature measurement, microstructure evaluation, strain assessment, cooling rate determination, microhardness testing, and tensile property characterization. The width of the weld zone varied from 183 µm to 297 µm, and the thermomechanical affected zone (TMAZ) area ranged from 4.48 mm² to 14.79 mm² across different process parameters. In the parent material, the volume fraction of the β-phase was as low as 20.2%, contrasting with the dominant α-phase at 79.8%. The average grain size of the lamellar and globular α-phase mixture was 26.4 µm. Notably, the weld zone exhibited extremely refined α-phase grains, with diameters less than 5 µm in all cases. The volume fraction of the β'-phase increased significantly with higher frequencies, from 15.299 % at 30 Hz to 26.98% at 50 Hz, peaking at 40.08% at 70 Hz, leading to varying k phases. This variation in microstructure had a substantial impact on mechanical properties. Tensile strength ranged from 503 MPa to 582 MPa, while ductility varied from 13.5% to 21.7%. Additionally, the hardness of the parent material increased from approximately 155 Hv to 260 Hv. This study demonstrates that controlling the oscillation frequency and amplitude in linear friction welding processes can yield consistent, high-quality welds in nickel aluminium bronze.

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“…For such applications, the use of high-alloy bronzes such as nickel-aluminum-bronze (NAB) or manganese-aluminum-bronze (MAB) is appropriate and widespread [1,2]. Both alloys are characterized by a complex multiphase microstructure [3] and there are numerous studies on NAB [4][5][6], but less on MAB [7,8]. Despite the differences in the chemical composition of the two bronzes, they have similar microstructures made up mainly of well-differentiated phases: α, β, and κ.…”

Section: Introductionmentioning

confidence: 99%

Etching of Manganese Aluminum Bronze by Ultrasound in Seawater

Biezma

Rasilla

Haubner

et al. 2022

Practical Metallography

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Manganese Aluminum Bronze (MAB), UNS designation C95700, is an alloy widely used for large marine propellers and other components in hydropower units. MAB has a complex microstructure due to precipitation of intermetallic phases as consequence of the cast process or thermal treatments. When investigating the marine corrosion behavior of MAB alloys, it was found that a metallographic etching attack occurred under the effect of ultrasound, similar to that observed with chemical reagents used for high-alloy bronzes. The main aim of this work is to compare the effects of etching on polished metallographic samples by ultrasound in seawater with that obtained with conventional chemical agents. It can be concluded that the effect of ultrasound is able to reveal, with great precision, the microstructure of MAB alloys, without the use of aggressive chemical agents, while the time under the influence of ultrasonic energy allows for fine-tuning the etching effect.

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Corrosion evaluation of welded nickel aluminum bronze and manganese aluminum bronze in synthetic sea water

Cited by 9 publications

References 35 publications

Cavitation of some copper alloys for naval propellers: electrolyte effect

Cavitation of some copper alloys for naval propellers: electrolyte effect

Role of oscillation frequency and amplitude on the microstructure and properties of linear friction welded nickel aluminium bronze joints

Etching of Manganese Aluminum Bronze by Ultrasound in Seawater

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