Publication detail

The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings

BUCHTÍK, M. DOSKOČIL, L. BRESCHER, R. DOLEŽAL, P. MÁSILKO, J. WASSERBAUER, J.

Original Title

The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings

Type

journal article in Web of Science

Language

English

Original Abstract

This paper deals with the study of the crystallization and phase transformation of Ni-P coatings deposited on AZ91 magnesium alloy. Prepared samples were characterized in terms of surface morphology and elemental composition by means of scanning electron microscopy with energy-dispersive spectroscopy analysis. The results of X-ray diffraction analysis and differential scanning calorimetry suggested that increasing the phosphorus content caused Ni-P coatings to develop an amorphous character. The crystallization of Ni was observed at 150, 250, and 300 °C for low-, medium- and high-phosphorus coatings, respectively. The Ni crystallite size increased with increasing temperature and decreasing P content. Conversely, the presence of the Ni3P phase was observed at a maximum peak of 320 °C for the high-phosphorus coating, whereas the crystallization of the Ni3P phase shifted to higher temperatures with decreasing P content. The Ni3P crystallite size increased with increasing temperature and increasing P content. An increase in microhardness due to the arrangement of Ni atoms and Ni3P precipitation was observed. The deposition of as-deposited Ni-P coatings led to an improvement in the corrosion resistance of AZ91. However, the heat treatment of coatings resulted in a deterioration in corrosion properties due to the formation of microcracks.

Keywords

Ni-P coating; AZ91 alloy; phase transformation; crystallization; corrosion behavior

Authors

BUCHTÍK, M.; DOSKOČIL, L.; BRESCHER, R.; DOLEŽAL, P.; MÁSILKO, J.; WASSERBAUER, J.

Released

13. 4. 2021

Publisher

MDPI

Location

Basel, Switzerland

ISBN

2079-6412

Periodical

Coatings, MDPI

Year of study

11

Number

4

State

Swiss Confederation

Pages from

1

Pages to

15

Pages count

15

URL

https://www.mdpi.com/2079-6412/11/4/447/htm

Full text in the Digital Library

http://hdl.handle.net/11012/196546

BibTex

@article{BUT171294,
  author="Martin {Buchtík} and Leoš {Doskočil} and Roman {Brescher} and Pavel {Doležal} and Jiří {Másilko} and Jaromír {Wasserbauer}",
  title="The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings",
  journal="Coatings, MDPI",
  year="2021",
  volume="11",
  number="4",
  pages="1--15",
  doi="10.3390/coatings11040447",
  issn="2079-6412",
  url="https://www.mdpi.com/2079-6412/11/4/447/htm"
}