2016
DOI: 10.3390/met6040091
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Microgalvanic Corrosion Behavior of Cu-Ag Active Braze Alloys Investigated with SKPFM

Abstract: Abstract:The nature of microgalvanic couple driven corrosion of brazed joints was investigated. 316L stainless steel samples were joined using Cu-Ag-Ti and Cu-Ag-In-Ti braze alloys. Phase and elemental composition across each braze and parent metal interface was characterized and scanning Kelvin probe force microscopy (SKPFM) was used to map the Volta potential differences. Co-localization of SKPFM with Energy Dispersive Spectroscopy (EDS) measurements enabled spatially resolved correlation of potential differ… Show more

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Cited by 19 publications
(16 citation statements)
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“…Sample preparation.-Proof of concept SKFPM was performed on a commercial 316L stainless steel coupon separated and thermally re-joined with an active brazing Cu-Ag-Ti alloy (further description of the sample is provided elsewhere). 44 The effect of polishing and sam ple preparation on VPDs has been previously observed and reported. 67 To minimize effects such as metal passivation and/or adsorbed species on the variability of acquired VPD values, the sample was prepared us ing the same steps for each map acquisition.…”
Section: Methodsmentioning
confidence: 92%
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“…Sample preparation.-Proof of concept SKFPM was performed on a commercial 316L stainless steel coupon separated and thermally re-joined with an active brazing Cu-Ag-Ti alloy (further description of the sample is provided elsewhere). 44 The effect of polishing and sam ple preparation on VPDs has been previously observed and reported. 67 To minimize effects such as metal passivation and/or adsorbed species on the variability of acquired VPD values, the sample was prepared us ing the same steps for each map acquisition.…”
Section: Methodsmentioning
confidence: 92%
“…Elemental mapping of the Cu-Ag-Ti braze region with SEM/EDS revealed a two-phase eutectic structure of copper-rich regions embedded within a silver-rich matrix, with titanium (a wetting agent) diffusing to the braze-steel interface ( Figure 4). 44 Thus, two distinct phases can be readily distinguished on the surface of the sample -a copper-rich phase (Cu-rich) and a silverrich phase (Ag-rich). Note that micro-segregation is still evident in this sample, meaning that each phase is rich in a certain element, but is still alloyed.…”
Section: Relative Work Functions Of Different Metallic Constituents-mentioning
confidence: 99%
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“…Joints formed by brazing offers as an alternative to common joining techniques, such as mechanical fastening and welding. The sample is further described elsewhere (20). The sample was polished with progressively finer silicon carbide pads from 400 to 1200 grit.…”
Section: Experimentationmentioning
confidence: 99%
“…[7][8][9] Scanning Kelvin Probe Force Microscopy (SKPFM) SKPFM imaging was conducted using a Bruker Dimension Icon AFM operating in frequency modulation (FM) PeakForce KPFM mode. [10][11][12] After polishing, each test coupon was cleaned with UHP N 2 prior to imaging to remove any loose surface particulates. A PeakForce amplitude of 75 nm and a lift height of 85 nm were used to acquire the topography and surface potential images, respectively.…”
Section: Alloys and Sample Preparationmentioning
confidence: 99%