SEM/EDS characterization of laser shock peening effect on localized corrosion of Al alloy in a near natural chloride environment

Trdan, Uroš; Grum, Janez

doi:10.1016/j.corsci.2014.01.032

Cited by 120 publications

(66 citation statements)

References 42 publications

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“…It was first reported by Yasuda et al [1] but did not receive too much attention until recent years. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The ignorance of E ptp [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] is due to: (i) most of pitting studies did not reverse the potential scan direction to evaluate repassivation kinetics [39][40][41][42][43][44][45] ; (ii) in many cases the inflection of backward sweep is far from obvious so that it can be easily negligible.…”

Section: Introductionmentioning

confidence: 99%

“…Cu and Ti Al, Al-10%Cu, Al-10%Cu-5%Ti [24] E ptp is more positive when adding more element; E ptp trend is the same with corrosion resistance of these three alloys 16 Mn and Mg Al-Mn and Al-Mg alloy [16] E ptp is more positive for Al-Mg alloy after 24 h of immersion in 3.5% NaCl solution; under the condition, Al-Mg alloy has better corrosion resistance 17 Laser shock peening AA6082-T651 [4,29] E ptp shows negative trend with i corr 18 ECAP pass number Al-Mg alloys [13] E ptp shifts to more negative values with increasing number of passes 19 Surface nanocrystallization AA 5083 [14] E ptp has more positive value for specimen with better corrosion resistance Figure 3a. Note that the applied load is ex-situ, that is, the samples were subjected to different applied load for 24 h in 3.5 wt% NaCl before electrochemical tests and the electrochemical tests were performed without load.…”

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confidence: 99%

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Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Sun

Chen

2018

Materials & Corrosion

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The influences of ex‐situ applied load, scan circle, reverse potential, chloride concentration, and temperature on inflection (Eptp) of backward sweep of cyclic polarization of 7150 Al alloy were investigated. The 2nd derivative of polarization curves was used to accurately determine the value of Eptp. Eptp is determined as the potential where massive metastable pits finished their repassivation process during reverse scan, providing an insight into highly constricted forms of localized corrosion repassivation. Chloride ion and diffusion condition have predominant effects on this inflection. Eptp showed non‐monotonic trend with temperature and relevant discussion was given as well.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Sun

Chen

2018

Materials & Corrosion

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“…The reducing of passivity was contributed by absorption of chloride ions onto the layer forming at the metals [38][39]. However, by coating silicon carbide nanocomposite coating into the metals, it acts as passive layer which can support the metal surface and reduce ions transfer from the metals.…”

Section: Corrosion Ratementioning

confidence: 99%

Corrosion behavior and resistance parameters of silicon carbide nanocomposite coating on different metals

Suriani¹,

Nik²,

Mansor³

et al. 2018

J. MECH. ENG. SCI.

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Silicon carbide (SiC) films were deposited on stainless steel (SS), mild steel (MS) and aluminium (Al) from a SiC targeted in a magnetron sputtering system to produce the amorphous SiC coating. Magnetron sputtering is a Physical Vapor Deposition process for deposited material onto substrate by ejecting atom from such SiC and condensing the ejected atom onto SS, MS and Al metals in high vacuum environment. The behavior of the films as corrosion protection barriers in different concentrations of sodium chloride (NaCl) solution in 0.5 M and 1.0 M at different temperatures (30 o C and 50 o C) were evaluated by electrochemical impedance spectroscopy (EIS) measurements. Films on SS exhibited a better corrosion resistance than MS and Al. The weight loss measurement, it shows that uncoated metals loss more weight than coated metals for longer time of immersion. Meanwhile the EIS results also depicted that the polarization resistance, (R p) coated metals indicates higher value compared to uncoated metals. The water salinity and temperatures also showed a significant effect on polarization resistance, (R p ) for both coated and uncoated metals. The R p are decreased with the increased of salinity and temperature accordingly. X-ray diffraction (XRD) used for determination of phase identification. Based on XRD, there are no higher peaks were obtained on SiC, and showed that SiC were confirmed amorphous. It concluded that this study shows corrosion rate of coated metals was decreased obviously compared to uncoated metals and SiC nanocomposite coating performed a significant corrosion behaviors and resistance parameter on different metals.

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“…More and more researchers have been paying comprehensive attention to LSP due to its high-pressure (in the scale of GPa), high-energy (more than 1 GW/cm 2 ), ultrafast (several tens of nanoseconds) and ultra-high strain rate (more than 10 6 s´1) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Distribution and Microstructure at a Laser Spot of AISI 304 Stainless Steel Subjected to Different Laser Shock Peening Impacts

Zhang

Luo

2015

Metals

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Abstract:The effects of different laser shock peening (LSP) impacts on the three-dimensional displayed distributions of surface and in-depth residual stress at a laser spot of AISI 304 stainless steel were investigated by X-ray diffraction technology with the sin 2 ϕ method and MATLAB 2010a software. Microstructural evolution in the top surface subjected to multiple LSP impacts was presented by means of cross-sectional optical microscopy (OM) and transmission electron microscopy (TEM) observations. Experimental results and analysis indicated that residual stress distribution and microstructure at a laser spot depended strongly on the number of multiple LSP impacts, and refined grain and ultra-high strain rate play an important role in the improvement of compressive residual stress of AISI 304 stainless steel. The analysis of treatment of the extended surface was presented to obtain uniform surface properties on the top surface of AISI 304 stainless steel.

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SEM/EDS characterization of laser shock peening effect on localized corrosion of Al alloy in a near natural chloride environment

Cited by 120 publications

References 42 publications

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Corrosion behavior and resistance parameters of silicon carbide nanocomposite coating on different metals

Residual Stress Distribution and Microstructure at a Laser Spot of AISI 304 Stainless Steel Subjected to Different Laser Shock Peening Impacts

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SEM/EDS characterization of laser shock peening effect on localized corrosion of Al alloy in a near natural chloride environment

Cited by 120 publications

References 42 publications

Inflection of backward sweep of cyclic polarization curve: Pit transition potential Eptp

Inflection of backward sweep of cyclic polarization curve: Pit transition potential Eptp

Corrosion behavior and resistance parameters of silicon carbide nanocomposite coating on different metals

Residual Stress Distribution and Microstructure at a Laser Spot of AISI 304 Stainless Steel Subjected to Different Laser Shock Peening Impacts

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Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp

Inflection of backward sweep of cyclic polarization curve: Pit transition potential E_ptp