Improving the Methodology for Coating Defects Detection

Llorca-Isern, Núria; Puig, María Margarida Bassols i; Espanol, Montse

doi:10.1361/105996399770350593

Cited by 17 publications

(11 citation statements)

References 5 publications

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“…The CLSM can be used to evaluate surface morphology. In a typical CLSM configuration, a laser beam scans the surface of the sample in a three‐dimensional mode . Here, we used this technique to show the difference in the surface morphology of the AA2098‐T351 in the polished (Figure A), as‐received (Figure B), and preattacked polished condition (Figure C).…”

Section: Resultsmentioning

confidence: 99%

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

Silva

Milagre

Oliveira

et al. 2019

Surface & Interface Analysis

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In this work, scanning electrochemical microscopy (SECM) measurements were employed to characterize the electrochemical activities on polished and as-received surfaces of the 2098-T351 aluminum alloy (AA2098-T351). The effects of the near surface deformed layer (NSDL) and its removal by polishing on the electrochemical activities of the alloy surface were evaluated and compared by the use of different modes of SECM. Confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) were also employed to characterize the morphology of the surfaces. The surface chemistry was analyzed by X-ray photoelectron spectroscopy (XPS). The surface generation/tip collection (SG/TC) and competition modes of the SECM were used to study hydrogen gas (H 2 ) evolution and oxygen reduction reactions, respectively. H 2 evolution and oxygen reduction were more pronounced on the polished surfaces. The feedback mode of SECM was adopted to characterize the electrochemical activity of the polished surface that was previously corroded by immersion in a chloride-containing solution, in order to investigate the influence of the products formed on the active/passive domains. The precorroded surface and as-received surfaces revealed lower electrochemical activities compared with the polished surface showing that either the NSDL or corrosion products largely decreased the local electrochemical activities at the AA2098-T351 surfaces. KEYWORDS aluminum alloy, localized corrosion, SECM, surface finishing condition 1 | INTRODUCTION Aluminum alloys are commonly used in automotive and aerospace applications because of their good mechanical properties and low density.There is an increase in the demand for materials that exhibit a combination of high specific strength and corrosion resistance for industrial applications. 1,2 In order to meet this demand, new generation aluminum-lithium (Al-Li) alloys with properties superior to those of the conventionally used Al alloys are being developed for use as structural components in aircraft. [3][4][5] The AA2098 Al-Cu-Li alloy was developed as a substitute for AA2024 and AA2219. The AA2098 alloy presents low density, high mechanical resistance, high toughness, high-temperature resistance, weldability, and good response to natural aging. These properties are achieved by a carefully tailoring its chemical composition, whose main alloying elements are Cu, Li, Mg, Ag, and Zr. The addition of lithium improves the mechanical properties of the Al alloy in that for every 1 wt% of Li added to aluminum, the density of the alloy is reduced by 3%, and the Young's modulus is increased by almost 6%. 5-7 However, this element increases the susceptibility of the alloy to localized

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Section: Resultsmentioning

confidence: 99%

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

Silva

Milagre

Oliveira

et al. 2019

Surface & Interface Analysis

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“…These unique behavior in Young's modulus -porosity relationship is very different from the monotonous decrease in Young's modulus with increasing porosity in porous copper [5][6]. This might be related to the particular spring-back behaviors of these No.3 and No.4 specimens.…”

Section: Young's Modulus Of the Friction Materialsmentioning

confidence: 98%

“…In order to examine the porous structure of the friction materials, epoxy resin containing a fluorescent dye was in vacuo impregnated into the pores of the dry specimen and then cured by heating at ambient pressure according to the procedure applied to coating defect detection [6]. The lateral surface of the resultant friction materials impregnated with the cured epoxy resin/ fluorescent dye was ground by emery paper to a flat surface and subjected to optical microscopy of the internal structure.…”

Section: Observation Of the Porous Structurementioning

confidence: 99%

Mechanical and Morphological Studies on Compressive Properties of Brake Materials

Kawabe

Kawai

Kōmoto³

et al. 2011

Sen-i Gakkaishi

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“…[1][2][3][4] In a typical CLSM configuration, a laser beam scans the surface of the sample in x, y direction. A small pinhole is located in front of the detector at a position that is optically conjugate to the focal point in the sample plane.…”

mentioning

confidence: 99%

“…1 In materials science it has been used, for example, to study defects in thermal spray coatings. 2 The method has recently been applied to corrosion studies on bare aluminum alloy 2024-T3 ͑AA2024-T3͒. 3,4 One advantage of CLSM for corrosion studies over traditional methods like scanning electron microscopy ͑SEM͒ is that measurements can be made on the surface in situ as corrosion damage develops over time, without serial removal and dry analysis under vacuum.…”

mentioning

confidence: 99%

Confocal Laser Scanning Microscopy as a Tool for In Situ Monitoring of Corrosion Underneath Organic Coatings

Schneider¹,

Ilevbare²,

Scully³

et al. 2001

Electrochem. Solid-State Lett.

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This paper discusses the application of confocal laser scanning microscopy for the investigation of corrosion processes on aluminum alloy AA2024-T3 occurring beneath a transparent organic coating. The ability of the microscope to monitor the topography of both the alloy surface under the coating and the surface of the coating, itself, in three dimensions, is demonstrated. The resolution limits (x, y, z), when imaging through a bulk solution, coating, and coating blister solution are better than 1 m. The technique described has potential to clarify the roles of alloy heterogeneity and corrosion damage associated with intermetallic phases at the micrometer scale on the underpaint corrosion process and coating blister formation and growth.

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Improving the Methodology for Coating Defects Detection

Cited by 17 publications

References 5 publications

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

The local electrochemical behavior of the AA2098‐T351 and surface preparation effects investigated by scanning electrochemical microscopy

Mechanical and Morphological Studies on Compressive Properties of Brake Materials

Confocal Laser Scanning Microscopy as a Tool for In Situ Monitoring of Corrosion Underneath Organic Coatings

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