These substances now have dual uses.
The figure presents two neutron radiographs of part of a frame made of 2219 aluminum alloy. The first radiograph, made before treating the frame with an LVCI, shows some corrosion and includes a faint dark line indicative of a weld crack at a corner. In the second radiograph, made after treating the frame with an LVCI, the weld crack is more clearly visible as a longer, thicker, bright line.
It has been conjectured that LVCIs may be useful as penetrant dyes for x-ray as well as for neutron radiography. Further research is needed to determine which formulations of LVCIs would be most suitable for dual use as corrosion inhibitors and penetrant dyes for radiography. For example, in formulating an LVCI for a particular application it might be possible to add a small amount of x-ray-attenuating material to enhance x-radio-
This work was done by Howard L. Novak and Phillip B. Hall of USBI Co. for Marshall Space Flight Center. For further information, access the Technical Support Package (TSP) free on-line at www.techbriefs.com/tsp under the Materials category.