Next Article in Journal
Intermetallic Reactions during the Solid-Liquid Interdiffusion Bonding of Bi2Te2.55Se0.45 Thermoelectric Material with Cu Electrodes Using a Sn Interlayer
Next Article in Special Issue
The Effect of the Si Content on the Morphology and Amount of Fe2SiO4 in Low Carbon Steels
Previous Article in Journal
Characterization of Precipitates in a Microalloyed Steel Using Quantitative X-ray Diffraction
Previous Article in Special Issue
Corrosion Resistance of the Superhydrophobic Mg(OH)2/Mg-Al Layered Double Hydroxide Coatings on Magnesium Alloys
Article Menu

Export Article

Open AccessArticle
Metals 2016, 6(4), 91; doi:10.3390/met6040091

Microgalvanic Corrosion Behavior of Cu-Ag Active Braze Alloys Investigated with SKPFM

Department of Materials Science and Engineering, College of Engineering, Boise State University, Boise, ID 83725-2090, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Vineet V. Joshi and Alan Meier
Received: 3 February 2016 / Revised: 21 March 2016 / Accepted: 6 April 2016 / Published: 19 April 2016
(This article belongs to the Special Issue Oxidation of Metals)
View Full-Text   |   Download PDF [11081 KB, uploaded 20 April 2016]   |  

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 differences with composition and subsequent galvanic corrosion behavior. Following exposure to the aggressive solution, corrosion damage morphology was characterized to determine the mode of attack and likely initiation areas. When exposed to 0.6 M NaCl, corrosion occurred at the braze-316L interface preceded by preferential dissolution of the Cu-rich phase within the braze alloy. Braze corrosion was driven by galvanic couples between the braze alloys and stainless steel as well as between different phases within the braze microstructure. Microgalvanic corrosion between phases of the braze alloys was investigated via SKPFM to determine how corrosion of the brazed joints developed. View Full-Text
Keywords: active braze alloy; corrosion; microgalvanic corrosion; electrochemistry; scanning kelvin probe force microscopy; stainless steel; Cu-Ag alloy; joining; scanning electron microscopy; energy dispersive spectroscopy active braze alloy; corrosion; microgalvanic corrosion; electrochemistry; scanning kelvin probe force microscopy; stainless steel; Cu-Ag alloy; joining; scanning electron microscopy; energy dispersive spectroscopy
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Kvryan, A.; Livingston, K.; Efaw, C.M.; Knori, K.; Jaques, B.J.; Davis, P.H.; Butt, D.P.; Hurley, M.F. Microgalvanic Corrosion Behavior of Cu-Ag Active Braze Alloys Investigated with SKPFM. Metals 2016, 6, 91.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top