The influence of tensile stress on electrochemical noise from aluminum alloy in chloride media

Liu, X.F.; Zhan, J.; Liu, Q.J.

doi:10.1016/j.corsci.2009.03.035

Cited by 27 publications

(9 citation statements)

References 29 publications

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“…Typically, with increasing laser scan speeds, the melt pool volumes have been shown to decrease, thus resulting higher cooling rates owing to highly pronounced convective and radiative cooling 36,41,61 . Furthermore, it has been fairly established that increasing stresses, either residual or externally applied, result in deterioration of corrosion resistance [83][84][85] . Therefore, in context of the present study, it has been observed that increasing laser scan speeds have been directly linked with decreasing corrosion resistance of the SDSS clads.…”

Section: Clad-heat Affected Zone Profile Properties As Presented Inmentioning

confidence: 99%

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Murkute

Pasebani

Isgor

2020

Sci Rep

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this study aims to improve the corrosion resistance of the low carbon steel by cladding it with super duplex stainless steel using laser powder bed fusion process. critical process parameters such as laser power, laser scan speed, hatch spacing, and powder layer thickness were optimized to achieve the best possible metallurgical bonding between the clad and the substrate. the evaporative losses experienced during the laser melting process resulted in clad layers with lower chromium content (12-25 wt. %) as compared to 26 wt. % of the feedstock powder. A clad thickness of 65.8 µm was achieved after melting ten 50 µm thick powder layers. the higher cooling rates associated with laser powder bed fusion resulted in fine high aspect ratio columnar grain structures with predominantly ferrite grains; however, widmanstätten austenite needles were observed with increasing laser scan speeds. increasing scan speed had a negative impact on the thickness, corrosion resistance, and the pitting potential of the clads exposed to 3.5 wt.% NaCl aqueous solution. Clads produced at the lowest scan speeds showed comparable corrosion resistance to rolled and annealed super duplex stainless steel. Duplex stainless steels (DSS) are a special class of ferrous alloys with a balanced ferrite (δ) and austenite (γ) phase microstructure. This dual-phase structure imparts these steels a high strength, toughness, and increased corrosion resistance in environments containing acids, acid chlorides, seawater, and caustic chemicals. Super duplex stainless steels (SDSS) 1 are a variant of DSS with higher Cr (25-26 wt. %) and Mo (4 wt. %) contents. SDSS typically shows superior pitting and stress corrosion cracking resistance than DSS; therefore, the use of SDSS has been increasing in highly corrosive environments, including oil and gas infrastructure, desalination plants, chemical storage tanks, heat exchangers, and paper/pulp manufacturing facilities 1. Although low carbon steel (LCS) remains to be the most widely used ferrous alloy, its applications are limited because it is highly vulnerable to corrosion in neutral, acidic, or saline environments 2. Corrosion-resistant SDSS alloys possess superior corrosion resistance than the LCS for the aforementioned applications, albeit with a significantly higher material cost. One of the viable means to reduce the component cost without compromising on service life is to manufacture a composite with a low-cost tough and ductile substrate cladded with a wear and corrosion resistant surface, as in the case of SDSS clads on an LCS substrate. These dissimilar metal composites (cladded systems) have been produced in the past using conventional manufacturing techniques such as welding 3-5 , diffusion bonding 6 , powder roll bonding 7 , hot rolling 8 , and reduction bonding 9. However, conventionally manufactured composites are often unfit for field use due to substandard clad-substrate bonding, often leading to clad delamination when subjected to operational stresses in the field. This substandard bond typically ...

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Section: Clad-heat Affected Zone Profile Properties As Presented Inmentioning

confidence: 99%

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Murkute

Pasebani

Isgor

2020

Sci Rep

View full text Add to dashboard Cite

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“…The lower corrosion potential may be due to the increase of dislocations, residual stress and Gibbs free energy. 5,30) As shown in our results, SP samples have more negative corrosion potential, but it doesn't means that SP samples are susceptible to corrosion in the initial stage of corrosion. In Fig.…”

Section: 2mentioning

confidence: 58%

Improving Corrosion Resistance Properties of Nickel-Aluminum Bronze (NAB) Alloys via Shot Peening Treatment

Zhao

Zhang

et al. 2019

Mater. Trans.

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In this paper, Nickel-Aluminum Bronze (NAB) alloy was subjected to the shot-peening (SP) treatment, and the corrosion resistance properties of SPed NAB alloy was systematically studied by scanning electron microscope, transmission electron microscopy, electrochemical workstation and immersion tests. The results show that SP treatment can improve the corrosion resistance properties of NAB alloy by controlling shot peening intensity. The SP treatment can result in rough surfaces, high-density dislocations and grain refinement of ¡ and ¢A martensitic phases in NAB alloy surface. In the corrosion medium, the corrosion resistance properties of SPed NAB alloys are related to not only the surface microstructures but also the surface roughness. The refined and homogenized microstructures favors the rapid formation of the protective passive film and promotes the occurrence of uniform corrosion on shot-peened NAB alloy surface, thus significantly improving their corrosion resistance properties. However, as the shot-peening intensity exceeds a critical value, the higher roughness values due to the large cracks, chips and flaking appearing on the shot-peened sample surface can deteriorate corrosion resistance properties.

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“…c) . Once the particles are detached from the pits, the corrosion process is stopped . Since Al 3 (Sc x Zr 1−x ) particles are formed at solidification step at higher temperature, the annealing treatment should not have great influence on the corrosion rate of the alloy, and thus alloy 01570 has almost the same corrosion rate in 3.5% sodium chloride solution.…”

Section: Discussionmentioning

confidence: 99%

Effect of annealing treatment on the mechanical properties and corrosion behaviors of 01570 aluminum alloy

Wang

Song

et al. 2013

Materials & Corrosion

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01570 aluminum alloy was cold rolled and annealed at different temperatures, and their microstructure, mechanical properties, pitting and stress corrosion cracking (SCC) behaviors were observed and determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), immersion test, slow strain rate tensile (SSRT), and constant loading tests. The results reveal that the dislocations within the grains of alloy 01570 are transformed from dislocation tangles to dislocation walls and subgrains as the treatment varies from the cold rolled temper to the annealed tempers; at the same time, the tensile strength and SCC resistance of alloy 01570 are increased and the elongation is decreased, whereas the corrosion rate is negligibly influenced by the annealing treatments. Therefore, the annealed at 300 8C temper can be selected as the optimum heat treatment for the practical application of alloy 01570.

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The influence of tensile stress on electrochemical noise from aluminum alloy in chloride media

Cited by 27 publications

References 29 publications

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Improving Corrosion Resistance Properties of Nickel-Aluminum Bronze (NAB) Alloys via Shot Peening Treatment

Effect of annealing treatment on the mechanical properties and corrosion behaviors of 01570 aluminum alloy

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