EFFECT OF COATING TIME ON CORROSION BEHAVIOR OF ELECTROLESS NICKEL-PHOSPHORUS COATED POWDER-METALLURGY IRON SPECIMENS

Authors
SINGH D BALASUBRAMANIAM R DUBE RK
Citation
D. Singh et al., EFFECT OF COATING TIME ON CORROSION BEHAVIOR OF ELECTROLESS NICKEL-PHOSPHORUS COATED POWDER-METALLURGY IRON SPECIMENS, Corrosion, 51(8), 1995, pp. 581-585
Citations number
8
Categorie Soggetti
Metallurgy & Metallurigical Engineering
Journal title
Corrosion → ACNP
ISSN journal
00109312
Volume
51
Issue
8
Year of publication
1995
Pages
581 - 585
Database
ISI
SICI code
0010-9312(1995)51:8<581:EOCTOC>2.0.ZU;2-B
Abstract
Powder metallurgy iron specimens with porosities in the range 0% to 2% were electroless coated with nickel-phosphorus alloy from baths conta ining sodium hypophosphite (NaH2PO2 . H2O). The effect of coating time on thickness and phosphorus content of the deposit was analyzed. The free corrosion potentials and corrosion rates of the coated specimens were obtained by the Tafel extrapolation method in 1.0 M hydrochloric acid (HCl) solution. Corrosion rates of the coated specimens after hea t treatment also were studied. The observed corrosion characteristics were explained by the mixed-potential theory.