Effect of NH 4HF 2 on deposition of alkaline electroless Ni-P coatings as a chromium-free pre-treatment for magnesium

A. A. Zuleta, E. Correa, M. Sepúlveda, L. Guerra, J. G. Castaño, F. Echeverría, P. Skeldon, G. E. Thompson

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

An alkaline electroless treatment that forms a low-phosphorus Ni-P coating on magnesium is described. The treatment is shown to provide a suitable base for deposition of a high-phosphorus, electroless nickel coating using a slightly acidic bath. The composition of the alkaline bath was selected to limit the corrosion of the substrate during coating and to avoid the utilization of chromate ions or hydrofluoric acid. An optimal amount of NH 4HF 2 is identified that provides a relatively thin Ni-P coating, with the subsequently-deposited, high-phosphorus coating enhancing the corrosion resistance of the magnesium in sodium chloride solution.

Original languageEnglish
Pages (from-to)194-200
Number of pages7
JournalCorrosion Science
Volume55
DOIs
StatePublished - Feb 2012
Externally publishedYes

Bibliographical note

Funding Information:
The authors are grateful to “Departamento Administrativo de Ciencia, Tecnología e Innovación–COLCIENCIAS”, University of Antioquia and University of Manchester for financial assistance to the Project 111545221131 . The authors also thank the Engineering and Physical Sciences Research Council (UK) for financial support (Programme Grant: LATEST2 ).

Keywords

  • A. Magnesium
  • A. Metal coating
  • B. Polarization
  • B. SEM
  • C. Kinetic parameters

Fingerprint

Dive into the research topics of 'Effect of NH 4HF 2 on deposition of alkaline electroless Ni-P coatings as a chromium-free pre-treatment for magnesium'. Together they form a unique fingerprint.

Cite this