Next Article in Journal
Novel Thiol-Ene Hybrid Coating for Metal Protection
Previous Article in Journal
Noisiness of the Surfaces on Low-Speed Roads
Article Menu
Issue 2 (June) cover image

Export Article

Open AccessArticle
Coatings 2016, 6(2), 16; doi:10.3390/coatings6020016

A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings

Department of Engineering Science, University West, 461 53 Trollhättan, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Robert B. Heimann
Received: 1 March 2016 / Revised: 20 March 2016 / Accepted: 25 March 2016 / Published: 31 March 2016
View Full-Text   |   Download PDF [6872 KB, uploaded 31 March 2016]   |  

Abstract

There is an increasing demand to replace Co-based coatings with cheap and environmentally friendly Fe-based coatings in corrosive environments. The main objective of this work was to evaluate whether Fe-based coatings could present a better corrosion performance than Co-based coatings. Therefore, two types of Fe-based and one type of Co-based coatings with chemical compositions (in wt %) of Fe-28Cr-16Ni-1.85C (FeNiCrC), Fe-17Cr-12Ni (FeNiCr), and Co-28Cr-1C (CoCrC) were produced by High Velocity Air Fuel (HVAF) spraying. The corrosion behavior of the coatings was studied comparatively by electrochemical tests in 3.5 wt % NaCl solution at 25 °C. The polarization test results showed that the FeCrNiC coating protected the underlying substrate better than the CoCrC coating, while the FeCrNi coating failed to hinder the penetration of corrosive ions. Electrochemical impedance spectroscopy (EIS) measurements revealed that the solution penetrated into the coating through defects, however the corrosion process slowed down due to clogging of the interconnected defects by corrosion products. Increasing the in-flight average particle temperature from 1400 °C to 1500 °C led to a denser coating with fewer defects which seemed to improve the corrosion resistance of the FeCrNiC coating. The high-alloyed Fe-based coatings had the best corrosion protection performance and can thus be recommended as a potential alternative to Co-based coatings. View Full-Text
Keywords: thermal spray coating; HVAF; corrosion; polarization; EIS thermal spray coating; HVAF; corrosion; polarization; EIS
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

Sadeghimeresht, E.; Markocsan, N.; Nylén, P. A Comparative Study of Corrosion Resistance for HVAF-Sprayed Fe- and Co-Based Coatings. Coatings 2016, 6, 16.

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]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top