Electrochemical techniques for the evaluation of porosity and corrosion rate for electroless nickel deposits on steel
- Univ. of Portsmouth (United Kingdom). School of Chemistry, Physics and Radiography
The use of electrochemical techniques in assessing the porosity of electroless nickel deposits (1--24 {micro}m) on steel substrates from hypophosphite baths is considered. The corrosion rate of the coated samples immersed in 0.125M H{sub 2}SO{sub 4} at 22 C was determined using Tafel extrapolation and was found to decrease with decreasing porosity. Analysis of anodic polarization curves and current-time data at fixed potentials gave a good indication of the extent of deposit porosity. The use of galvanic coupling experiments between a non-porous coating and test samples of varying deposit thickness was also examined. The shape of the porosity vs. coating thickness curve was similar for all the methods investigated, the porosity decreasing for thicker deposits.
- OSTI ID:
- 548539
- Report Number(s):
- CONF-970332-; TRN: IM9750%%95
- Resource Relation:
- Conference: Corrosion 97. 52. annual corrosion conference of the National Association of Corrosion Engineers: economics and performance - bridging the gap and NACExpo, New Orleans, LA (United States), 9-14 Mar 1997; Other Information: PBD: 1997; Related Information: Is Part Of Corrosion/97 conference papers; PB: [4584] p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electroless Ni coatings used in 4% NaCl corrosion control of mild steel
Study of electroless Ni-W-P alloy coating on martensitic stainless steel