Molecular Dynamics-Based Scheme of Designing Nanostructured Cu-Ni Alloy Thin Film for Coating on Advanced Structural Components in Naval Vessels

Bandyopadhyay, Krishnan; Das, Suchandrima; Ghosh, K. S.; Ghosh, Monidipa

doi:10.1007/s11665-022-07362-7

Cited by 2 publications

(1 citation statement)

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“…This not only shortens the service life of the ship and reduces the in-service rate, but also increases the ship's sailing resistance, thus, significantly increasing fuel consumption [1]. When subject to different seasons or regions, submerged protective coatings may be exposed to harsh atmospheric conditions such as high-temperature exposure, low-temperature freezing, and strong winds, accelerating the damage incurred; therefore, the use of surface engineering technology the strengthen the surface of key ship components is a proven method [2]. High-energy beam laser melting technology [3] has the advantages of a fast cooling rate, small heat-affected zone, and small substrate deformation, and the prepared coating has a low dilution rate, fine and uniform dense organization, and forms a good metallurgical bond with the substrate; thus, it is widely used for the surface strengthening of large machinery and key components in the fields of shipping tools, metallurgy, and mining.…”

Section: Introductionmentioning

confidence: 99%

Study on the Corrosion Resistance of Laser Clad Al0.7FeCoCrNiCux High-Entropy Alloy Coating in Marine Environment

Lü

2022

Coatings

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In the marine atmosphere, the corrosion rate of ship components is 4–5 times higher than that of the inland atmosphere. To solve the serious corrosion problem arising from long-term service in the marine environment of naval aircraft and ships, etc., this paper takes Al0.7FeCoCrNiCux system high-entropy alloy coating prepared by laser melting technology with 5083 aluminum alloys as the base material and analyzes the aging and failure mode of equipment coating under a marine atmospheric environment. XRD and SEM were utilized to study the microscopic morphological structure of the coatings. The laws of influence of Cu elements on the electrochemical corrosion behavior of the Al0.7FeCoCrNiCux system high-entropy alloy in 3.5 wt.% NaCl neutral solution was investigated by using dynamic potential polarization and electrochemical impedance spectroscopy, and neutral salt spray acceleration tests and outdoor atmospheric exposure tests were carried out. The results show that the Al0.7FeCoCrNiCux (x = 0) high-entropy alloy coating has a single BCC phase structure and the Al0.7FeCoCrNiCux (x = 0.30, 0.60, 0.80, 1.00) high-entropy alloy coating consists of both BCC and FCC phases with a typical dendrite morphology. With the increase in Cu content, the self-corrosion potential of Al0.7FeCoCrNiCux gradually increases and the current density gradually decreases, which with the results of the electrochemical impedance spectrum analysis, indicating that the corrosion resistance of Al0.7FeCoCrNiCu1.00 is optimal. The results of the neutral salt spray acceleration test and the outdoor atmospheric exposure test were integrated to conduct a comprehensive evaluation of the corrosion resistance of the coating. The corrosion resistance of Al0.7FeCoCrNiCux coating increases with the increase in Cu content, and the impressive strength and plastic deformation are best when x = 0.80. Neutral salt spray accelerated the test with no corrosion at 5040 h, and even if the coating is broken, it can last up to 4320 h. In the outdoor atmospheric exposure test, which was conducted 12 months after the coating surface test, no corrosion occurred.

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Section: Introductionmentioning

confidence: 99%