Corrosion Resistant, Structurally Reinforced, Thermal Spray Coatings for In Situ Repair of Load Bearing Structures.

摘要

This project is developing and laying the groundwork for in-situ reclamation of corroded components in load bearing infrastructures (e.g., bridges) imparting robust corrosion protection using high-velocity thermal spray. This novel approach may provide interim or even potentially long term solution to material loss and continued degradation of certain infrastructure components and provide the Department of Transportation a new tool in infrastructure maintenance. The project was initiated in February 2011 and optimization for high-velocity oxy-fuel (HVOF) processing has begun to determine the parameters necessary to produce a fill coating with residual compressive stresses. In addition, steel dog bone tensile test bars have been acquired. The gauge section has been reduced in thickness allowing for buildup of the gauge with HVOF-sprayed material. In the second quarter, exploration of both Fe- and Ni-based powders occurred to determine how high velocity oxy-fuel (HVOF) processing can be used to impart compressive stresses in the surface of reclaimed structures.