Browse Prior Art Database

Protection of Magnetic Disks From Environmental Corrosion by Plasma- Polymerized Coatings

IP.com Disclosure Number: IPCOM000039178D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Brusic, VA: AUTHOR [+3]

Abstract

A plasma-polymerized fluorocarbon coating is an effective mechanism for the protection of metal substrates from corrosive environments. Polymerized layers, as thin as 100 Ao, have been found to successfully block more than 99% of the surface. A fluorocarbon polymer was deposited on both copper and cobalt phosphate substrates. Hexafluoropropylene was selected as the monomer because of the hydrophobic property of poly-hexafluoropropylene (PHFP). Plasma polymerization was performed in a parallel plate system and deposition rates ranging between 100 Ao and 170 Ao per minute were achieved. The effectiveness of the thin plasma-polymerized films on both copper and cobalt phosphate samples for corrosion protection in an aqueous medium was tested by electrochemical techniques.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

Page 1 of 2

Protection of Magnetic Disks From Environmental Corrosion by Plasma- Polymerized Coatings

A plasma-polymerized fluorocarbon coating is an effective mechanism for the protection of metal substrates from corrosive environments. Polymerized layers, as thin as 100 Ao, have been found to successfully block more than 99% of the surface. A fluorocarbon polymer was deposited on both copper and cobalt phosphate substrates.

Hexafluoropropylene was selected as the monomer because of the hydrophobic property of poly-hexafluoropropylene (PHFP). Plasma polymerization was performed in a parallel plate system and deposition rates ranging between 100 Ao and 170 Ao per minute were achieved. The effectiveness of the thin plasma-polymerized films on both copper and cobalt phosphate samples for corrosion protection in an aqueous medium was tested by electrochemical techniques. Corrosion behavior of each sample was evaluated by several measurements (e.g., polarization resistance, Tafel plot, potentiodynamic sweep). The figure shows a set of potentiodynamically obtained potential-log I curves for Cu films. As compared to film-free copper, a sample with about 100 Ao of PHFP shows significantly smaller currents at and around the corrosion potential. The reduction in the corrosion rate for the two samples tested is shown in Table 1. The presence of PHFP has drastically reduced metallic dissolution with only a slight decrease in the corrosion potential. The measured values reflect the effe...