Abstract
The joining of steel and a thermoplastic resin without adhesives was investigated using a roughened electrodeposited nickel film. The roughened film was fabricated by composite plating techniques using carbon nanotubes. Chemical etching of the roughened film was also examined. The steel coated with the roughened film was joined to the thermoplastic resin by injection molding. The bonding strength was evaluated by means of a tensile lap shear strength test and the microstructure of the boundary between the coated steel substrate and the resin was analyzed. The shear strength between the steel coated with the etched roughened film and the resin exceeded 40 MPa with very little variation and the fracture mode was cohesive failure of the resin. This method offers a way to achieve consistent bonding strength with different metal substrates.
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