Evaluation of corrosion resistance of AA6082-T651 aluminium alloy after laser shock peening by means of cyclic polarisation and ElS methods

Trdan, Uroš; Grum, Janez

doi:10.1016/j.corsci.2012.03.019

Cited by 215 publications

(80 citation statements)

References 34 publications

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“…Similar RS results were obtained in our previous publications [11,18,29] and are consistent results after LSP in other publication [7,14,42].…”

Section: Micro-hardness and Residual Stressessupporting

confidence: 81%

“…As a result, high compressive residual stresses are generated and confined to a shallow surface layer whilst balancing low-tensile residual stresses are spread deeper throughout the cross-section of the material [12], Enhancement of fatigue, corrosion, stress corrosion and wear resistance has already been proved for various types of materials, such as aluminium and titanium alloys and different types of steel [11][12][13][14][15][16][17][18]. In our recent publication [18], we investigated the effect of LSPwC treatment on corrosion behaviour on an AA6082 aluminium alloy in a 0.6 M NaCI solution. Both cyclic polarisation (CP) and electrochemical impedance spectroscopy (EIS) measurements confirmed the beneficial effect of LSPwC treatment.…”

Section: Introductionmentioning

confidence: 99%

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Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of \ = 1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus® microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 um) in the transverse direction (Omin) of laser-beam movement, i.e. -407 ±81 MPa and -346 ± 124 MPa, after 900 and 2500 pulses/cm 2 , respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 um below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both I and T directions.

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“…Similar RS results were obtained in our previous publications [11,18,29] and are consistent results after LSP in other publication [7,14,42].…”

Section: Micro-hardness and Residual Stressessupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

Self Cite

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“…Also, potentiostatic analyses were performed for the observation of the resistance of the coatings over time. For this purpose, a fixed potential was applied on the cell for 28 h. The open circuit potential curves (OCP) showed that at equilibrium conditions, the potential curves of the coated samples fit the values of the OCP curve of a blank AA2024 substrate (in the range of −0.6 and −0.8 V related to SCE, in line with the literature [29]). The potential windows applied on the coated surfaces ranged from a −0.5 to 2.5 V (vs. SCE), and the corresponding current density was in the order of nanoampères, which confirms the barrier effect of the coating ( Figure 5).…”

Section: Corrosion Testsmentioning

confidence: 71%

Poly(Phenylene Methylene): A Multifunctional Material for Thermally Stable, Hydrophobic, Fluorescent, Corrosion-Protective Coatings

et al. 2018

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Poly(phenylene methylene) (PPM) is a thermally stable, hydrophobic, fluorescent hydrocarbon polymer. PPM has been proposed earlier to be useful as a coating material but this polymer was isolated in relevant molar masses only recently, and in large quantities. Accordingly, the preparation of coatings based on PPM and their behavior was explored in this study, with the example of the metal alloy AA2024 as a common substrate for corrosion tests. Coatings free of bubbles and cracks were obtained by hot pressing and application of the following steps: Coating on AA2024 with a layer of polybenzylsiloxane to improve the adhesion between PPM and the metal surface, the addition of polybenzylsiloxane to PPM in order to enhance the viscosity of the molten PPM, and the addition of benzyl butyl phthalate as a plasticizer. Electrochemical corrosion tests showed good protection of the metal surface towards a NaCl solution, thanks to a passive-like behavior in a wide potential window and a very low current density. Remarkably, the PPM coating also exhibited self-healing towards localized attacks, which inhibits the propagation of corrosion.

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“…또한 잔류응력을 개선시키는 방안은 초기 용접 시에 유발되었던 인장잔류응력을 표면처리를 통해 압 축잔류응력으로 변화시켜 주는 것이다. 압축잔류응력을 만 드는 표면처리 기술의 종류로는 shot peening [2][3][4][5][6][7] , laser shock peening [8][9][10][11] , water jet peening 12) , ultrasonic peening 13) , Ultrasonic Nanocrystal Surface Modification (UNSM) 14,15) 등이 있다.…”

Section: 서론unclassified

Intergranular Corrosion of 316L Stainless Steel by Aging and UNSM (Ultrasonic Nano-crystal Surface Modification) treatment

Lee¹,

Kim

2015

Corrosion Science and Technology

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Austenitic stainless steels have been widely used in many engineering fields because of their high corrosion resistance and good mechanical properties. However, welding or aging treatment may induce intergranular corrosion, stress corrosion cracking, pitting, etc. Since these types of corrosion are closely related to the formation of chromium carbide in grain boundaries, the alloys are controlled using methods such as lowering the carbon content, solution heat treatment, alloying of stabilization elements, and grain boundary engineering. This work focused on the effects of aging and UNSM (Ultrasonic Nano-crystal Surface Modification) on the intergranular corrosion of commercial 316L stainless steel and the results are discussed on the basis of the sensitization by chromium carbide formation and carbon segregation, residual stress, grain refinement, and grain boundary engineering.

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Evaluation of corrosion resistance of AA6082-T651 aluminium alloy after laser shock peening by means of cyclic polarisation and ElS methods

Cited by 215 publications

References 34 publications

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Poly(Phenylene Methylene): A Multifunctional Material for Thermally Stable, Hydrophobic, Fluorescent, Corrosion-Protective Coatings

Intergranular Corrosion of 316L Stainless Steel by Aging and UNSM (Ultrasonic Nano-crystal Surface Modification) treatment

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