A Study of the Corrosion Resistance of Thermal Sprayed Stainless Steel Coatings for Reinforcing Bars

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Title: A Study of the Corrosion Resistance of Thermal Sprayed Stainless Steel Coatings for Reinforcing Bars

Author(s): Ping Gu, Bernard Arsenault, J. J. Beaudoin, Jean-Gabriel Legoux, Bernard Harvey and Joel Fournier

Publication: Special Publication

Volume: 171

Issue:

Appears on pages(s): 389-412

Keywords: Coatings; corrosion resistance; reinforced concrete; steels; thermal properties.

Date: 8/1/1997

Abstract:
The potential of using the stainless steel coatings to protect steel reinforcing bars from corrosion especially in a salt contaminated concrete environment was evaluated. Type 304, 3 16 and 420 stainless steel coated coupons and reinforcing bars were prepared using the Twin-Wire Electric Arc (TWEA) and High Pressure/High Velocity Oxygen-Fuel (HP/HVOF) processes. Metallographic examinations were conducted to determine the coating density and the oxide content. The corrosion resistance of the coatings was evaluated using linear polarization and salt spray techniques. The stainless steel coating prepared using the HP/HVOF process had a much superior corrosion resistance performance than those prepared using the TWEA process. The former process produced a dense, low oxide content coating while the latter produced relatively porous coatings.The oxide content of the coating in the TWEA process can be significantly reduced using argon or nitrogen as primary and arc jet gases. This did not have a significant effect on porosity of the coating.