Copper redeposition and surface enrichment during the dissolution of Al‐Cu alloys in different concentrations of NaCl solution. Part 1 – electrochemical measurements

Warraky, A. A. El; El-Aziz, A. M.; Soliman, Kh.A.

doi:10.1108/00035590710748623

Cited by 6 publications

(19 citation statements)

References 19 publications

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“…2(a) that: none of these curves exhibited any active-passive transition. This is in agreement with previously published data which represent that, Al can form a protective passive film in air before treatment (11,12) . E corr of the cold worked Al (zero) (Fig.…”

Section: Electrochemical Measurementsupporting

confidence: 94%

“…Another work by the present author reported previously (11,12) that the Cu cluster itself go to the solution as a result of the galvanic attack around the cluster itself. Accordingly it can be confidently mentioned therefore that the dissolution of the different phases recorded was due to the above of the four previous mentioned reasons as, the first one occurs by a simple dealloying of the intermetallic compound as in equation (1).…”

Section: ++mentioning

confidence: 57%

“…2. The second reason is related to the previous study (11) at the same concentration of NaCl which concluded that E corr was the same as the pitting potential (E pit ) ( E pit and E corr coincide). While the third one is related to the appearance of these steps at definite values of potential as represented in Table 1.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

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Improving Corrosion Resistance of Al through Sever Plastic Deformation 2-under Accelerated Condition

2016

Egypt. J. Chem.

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HE CORROSION resistance of Aluminum (Al) in 3.5% NaCl …….was improved after surface mechanical attrition treatment (SMAT). Cyclic potentiodynamic polarization (CPP) measurements have shown hysteresis's loop area owing to localized attack. Surface examinations using scanning electron microscopy (SEM), electron dispersive X-ray (EDX), X-ray diffraction (XRD) and grazing induced X-ray diffraction (GIXRD) have been used to investigate changes of composition on the surface at different depths. The result of polarization shows that as increasing the time of annealing before 10 min SMAT the surface of Al becomes more resistance and behaves similar to that of adding cathodic inhibitor. The study was carried out also for the annealed samples after different time of SMAT 0, 5, 10, 15, 20 and 25 min. proved that the corrosion resistance was improved with increasing the time till 15 min treatment and decreased again after that. CPP experiments at all the time except at 15 min SMAT recorded the formation of different steps at different potential after the corrosion potential. The steps are similar to that recorded due to formation of protective film and the break down due to pitting corrosion. GIXRD proved that the appearance of these steps is due to the formation of different metallic and intermetallic solid solution phases which have different corrosion potential. On the other hand the more corrosion resistance of 15 min SMAT was attributed to the formation of the most anodic phase of Al 39 Cu 47 . The dissolution of the treated SMAT Al in 3.5 % NaCl are localized attack and mainly intergalvanic corrosion where its rate depends on the defence between the corrosion potential of the phases recorded and the Al substrate.Compounds present in Al and Al alloys may be either non-metallic impurities, forming intermetallic compounds or components going into solid solution intergranularly (1) . On the other hand, metallic impurities present either as elements or as intermetallic compounds where, the corrosion resistance of Al depends on its corrosion potential (2) . In part 1 of the present work, the corrosion resistance of grain refines Al using surface mechanical attrition treatment (SMAT) in 3.5% NaCl was investigated under free condition. The techniques used were open circuit potential and surface examination such as scanning electron microscopy (SEM), electron dispersive X-ray (EDX) and X-ray

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Section: Electrochemical Measurementsupporting

confidence: 94%

Section: ++mentioning

confidence: 57%

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Improving Corrosion Resistance of Al through Sever Plastic Deformation 2-under Accelerated Condition

2016

Egypt. J. Chem.

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“…These effects are consistent with an initial redeposition of copper (a well known phenomenon in copper corrosion 13,28,29 ) resulting in stratification in the surface layer with copper being observed from the substrate surface, but also in regions up to 350 µm above this (rearranging equation (4) to find t). These layers then recorrode and disappear leaving the intensity of the surface peak weakened by absorption.…”

Section: Evolution Of the Corrosion Layersupporting

confidence: 80%

The Use of Synchrotron X-rays To Observe Copper Corrosion in Real Time

Dowsett¹,

Adriaens²,

Martin³

et al. 2012

Anal. Chem.

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We have developed and tested two complementary methods for making time-lapse synchrotron X-ray diffraction (XRD) measurements of the growth of synthetic corrosion layers using a protocol for producing copper (I) chloride (nantokite), on copper as a test. In the first method a copper coupon was spin-coated with saturated copper (II) chloride solution in air whilst the surface was characterized in real time using XRD with a fast 1-D detector. In the second, a droplet of the same reagent was suspended from an X-ray transparent window in a hermetically sealed cell and the coupon was brought into contact with this whilst XRD diffractograms were acquired with a CCD camera. The protocol is completed by a deionized water rinse which was also studied. The XRD shows nantokite precipitation in solution as well as growth on the surface, but the end products were variable proportions of nantokite cuprite, and paratacamite.The latter two were observed forming in a reaction between the nantokite and the rinsing water.Comparisons between samples analyzed in the synchrotron and at lower power densities show that the effects of any radiolysis or slight heating of the sample are insignificant in this case. It would be simple to extend these methods to other corrosion or surface reaction systems.

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“…In the secondary-electron image mode, at an accelerated voltage of 30 keV, magnification 10X up to 400.000X and a resolution for W (3.5 nm) were used. Details of surface pre-treatment, solution preparation and other experimental methods were described in the Part I report (El Warraky et al, 2007). Figure 1 shows the variation in potential of both pure Al and Al-3.84%Cu alloy versus time under OCP which was mentioned previously in Part I (El Warraky et al, 2007).…”

Section: Methodsmentioning

confidence: 98%

Copper redeposition and surface enrichment during the dissolution of Al‐Cu alloys in different concentrations of NaCl solution. Part 2 – spectroscopic analysis measurements

Warraky¹,

El-Aziz²,

Soliman³

2007

Anti-Corrosion Methods and Materials

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Purpose -The paper aims to examine the enrichment of Cu, and the type of attack occurring during the dissolution of Al-3.84%Cu alloy in 0.5 M NaCl. Design/methodology/approach -The approach is to use scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) and solution analyses using atomic absorption spectrophotometry. Findings -Examination of the surface after five days of immersion showed that Cu clusters had concentrated around the edges of the specimens and two types of localized corrosion were evident, pitting corrosion and the intergranular attack, which were concentrated mainly around the Cu clusters and in the regions where a higher concentration of Cu was evident. After 80 days of immersion, the higher concentration of Cu was distributed over nearly the entire surface and its concentration differed from one site to another. Originality/value -The analysis results of the study confirmed the mechanism of simultaneous dissolution.

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Copper redeposition and surface enrichment during the dissolution of Al‐Cu alloys in different concentrations of NaCl solution. Part 1 – electrochemical measurements

Cited by 6 publications

References 19 publications

Improving Corrosion Resistance of Al through Sever Plastic Deformation 2-under Accelerated Condition

Improving Corrosion Resistance of Al through Sever Plastic Deformation 2-under Accelerated Condition

The Use of Synchrotron X-rays To Observe Copper Corrosion in Real Time

Copper redeposition and surface enrichment during the dissolution of Al‐Cu alloys in different concentrations of NaCl solution. Part 2 – spectroscopic analysis measurements

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