Investigation of Corrosion Behaviour of Aluminium Alloy Subjected to Laser Shock Peening without a Protective Coating

Trdan, Uroš; Grum, Janez

doi:10.1155/2015/705306

Cited by 27 publications

(11 citation statements)

References 34 publications

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“…Due to this efect, the heating of PCB at 100 °C will only involve in the removal of moisture content without signifcant change in the mineral phases. Te immersion in hydrochloric acid only removed the insulating layer, not involved in any other chemical reaction to form new elements [17], as confrmed by the EDAX results. Also, the results of Table 1 indicates that there is no sign of existence of the target materials in the pretreated PCB powder and confrmed the complete removal of target materials from the PCB.…”

Section: Immersion In Hydrochloricmentioning

confidence: 54%

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Mohana¹,

Selvaganesh²,

Issac³

et al. 2023

Advances in Materials Science and Engineering

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Corrosion in steel leads to the deterioration of reinforced concrete structures due to chemical reactions between steel and its surrounding atmosphere. In this paper, a novel anticorrosive powder was derived from the waste Printed Circuit Board (PCB) and manually coated on the steel rebar of the reinforced concrete specimen. The corrosion-resistant efficiency of the developed nano PCB-coating on the steel bars was studied by polarization, electrochemical impedance spectroscopy, and accelerated corrosion technique. Also, the applicability of the nano PCB-coated rebar as reinforcement in the concrete environment was investigated. From the results, it was observed that the nano PCB-coated specimens exhibited 3.5 times reduced rate of corrosion and lost only 46.15% strength and 52.5% diameter under the accelerated rate of 6 V after 48 hours. The presence of nano PCB powder improved the corrosion-resistant behaviour of the steel rebar by 1.65 times of the noncoated specimen. Also, the nano PCB-coating reduced the loss in residual yield strength of the corroded steel rebar by 32% lesser than the noncoated specimens and exhibited similar corrosion-resistant properties as that of the existing zinc coating. In addition to the corrosion resistance, the nano PCB-coated steel rebar exhibited almost similar adhesion with concrete as that of the commercial zinc coating which is 7% lower than uncoated steel rebars. It was inferred from this research work that the proposed anticorrosive coating prepared from the waste nano PCB powder showed better corrosion-resistant behaviour and reduced the overall cost of coating by 42%, which ensures economy and serviceability.

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Section: Immersion In Hydrochloricmentioning

confidence: 54%

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Mohana¹,

Selvaganesh²,

Issac³

et al. 2023

Advances in Materials Science and Engineering

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“…This agrees with the negligible minor effects seen in electrochemical behaviour after both laser-peening types. Aside from a few studies [41][42][43]62,66], residual stresses are reported to mostly have a significant effect only when retarding corrosion in processes where there is an external mechanical stimuli, such as corrosion fatigue and stress corrosion cracking [28][29][30][31][32][33][34][35][36][37][38][39][40]. In contrast, Liu and Frankel [63] evaluated the direction of compressive residual stress relative to the direction of intergranular corrosion (IGC).…”

Section: Mechanisms For Aa7075-t651 Corrosion Initiationmentioning

confidence: 99%

“…Specifically, for LSPwC, studies report compressive residual stresses can improve corrosion performance. For example, studies on an LSP aerospace alloy [41,42] and aluminium-silicon alloys [22] show improvement in pit numbers and size after laser peening, and a decrease in corrosion current density, and show how increased power density will increase surface roughness, in most cases promoting higher corrosion current density. In the case of AA7075, one study [43] shows a small (50 mV) ennoblement in open-circuit potential after shot peening.…”

Section: Introductionmentioning

confidence: 99%

Effects of ablative and non-ablative laser shock peening on AA7075-T651 corrosion and fatigue performance

Sanchez

Leering

Glaser

et al. 2021

Materials Science and Technology

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The fatigue performance from pre-corroded pits was studied in laser-shock-peened AA7075-T651 with and without a protective ablation-layer. Surface and microstructural characterisation showed laser-shock-peening generated residual stresses up to −400MPa, limited hardness and moderate surface roughness increase. The laser-shock-peened specimens were exposed to 3.5 wt-% sodium chloride solution for different levels of galvanostatic control. The compressive residual stresses did not significantly affect corrosion behaviour, or corrosion pit morphology. Laser-shock-peening-induced surface roughness had the most detrimental impact on corrosion performance. Fatigue testing of pre-corroded AA7075-T651 showed pits act as stress concentrations. Cracks initiated shortly after dynamic loading, reducing fatigue life by 50%. Laser-shockpeening increased fatigue life by 400% compared to corroded-untreated AA7075-T651, due to residual stresses effectively counteracting stress concentrations produced by pits. Highlights• Pre-corroded laser-peened (LSP and LSPwC) AA7075-T651 fatigue performance is investigated. • XRD and incremental hole drilling show deeper compressive residual stresses for LSPwC compared to LSP. • Electrochemical tests show no significant changes in corrosion behaviour after laser peening.• Fatigue testing and fractography show compressive residual stresses effectively counteract stress concentrations at pits.

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“…Composed of support layer (core layer) and brazing layer (clad layer), multilayer aluminum brazing sheets have been widely used in heat exchanger and honeycomb sandwich structure [1] due to their low density, high thermal conductivity, and excellent corrosion resistance [2][3][4][5]. In order to reduce the weight of automotive parts and cut down production cost of the heat exchanger, the thickness of the Al brazing sheet has to be decreased [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Annealing and Deformation on Sagging Resistance of a Hot‐Rolled, Four‐Layered Al Alloy Clad Sheet

Kang

Zhou

Deng

et al. 2021

Advances in Materials Science and Engineering

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Multilayer brazeable aluminum alloy sheet is prone to collapse during high-temperature brazing process. The sagging resistance of the aluminum composite sheet needs to be further improved for quality control. Effects of annealing and rate of reduction on sagging resistance, microstructure, and Si diffusion of a hot-rolled, four-layered Al clad sheet (4343/3003/6111/3003) were investigated by means of a sagging device, OM, SEM, and TEM. Results showed that once annealed at 360°C, the sagging distance was increased from 3 to 15.7 mm as the reduction rate changed from 10% to 40%. By increasing annealing temperature to 410°C, those were changed from 3.1 to 20.8 mm accordingly. At 360°C/40% and 410°C/40%, specimens exhibited weak sagging resistance, whereas fine recrystallized grains were formed in the core promoting Si penetration along grain boundaries. While the specimens were treated at 360°C/10% and 410°C/10%, better sagging resistance was observed due to the formation of coarse recrystallized grains that can suppress erosion of Si. At the same reduction rate, the sagging resistance was higher for the sample annealed at a lower temperature as more precipitates appeared in the core (at 360°C), thus leading to an increase in strength.

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Investigation of Corrosion Behaviour of Aluminium Alloy Subjected to Laser Shock Peening without a Protective Coating

Cited by 27 publications

References 34 publications

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Effects of ablative and non-ablative laser shock peening on AA7075-T651 corrosion and fatigue performance

Effects of Annealing and Deformation on Sagging Resistance of a Hot‐Rolled, Four‐Layered Al Alloy Clad Sheet

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