Premium
Adhesion of electrochemically formed polypyrrole coatings to low carbon steel
Author(s) -
Iroh Jude O.,
Su Wencheng
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10742
Subject(s) - polypyrrole , materials science , carbon steel , adhesion , composite material , carbon fibers , electrolyte , shear strength (soil) , monomer , corrosion , polymer , electrode , polymerization , chemistry , composite number , environmental science , soil science , soil water
The lap shear strength of polypyrrole coatings formed on low carbon steel (∼ 23 MPa) is shown to be significantly higher (by ∼ 60%) than that obtained using uncoated steel as the adherend. The lap shear (adhesion) strength of polypyrrole‐coated steel varied with the pH of the monomer–electrolyte solution and the applied current. The low carbon steel‐containing polypyrrole coatings formed at low pH (pH ≤ 2.4) have higher adhesion strength than those coated with polypyrrole at higher pH (pH ≥ 6.0). However, poly( N ‐methyl pyrrole)‐coated steel showed significantly lower adhesion strength. Increasing the applied current density decreased the adhesion strength. The surface free energies of polypyrrole coatings, ∼ 49–53 mJ/m 2 are similar to that obtained for uncoated low carbon steel, ∼ 53 mJ/m 2 , indicating that polypyrrole will effectively wet lowrbon steel. The extent of wetting of low carbon steel by the coatings was additionally confirmed by an interaction parameter, ϕ, of unity. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2757–2763, 2002