Method of detecting a cathodic corrosion site on a metallized substrate
First Claim
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1. A method of detecting a cathodic corrosion site on a metallized substrate comprising the steps of:
- depositing a relatively thin film of molecules of a pH sensitive fluorescent dye adjacent a metallic surface of said substrate, said metallic surface having a corrosion site thereon characterized by a reduction of the hydronium ion to hydrogen (2H+ +2e- →
H2) in a moist ambient capable of supplying H+ ions,applying an electrical bias across said surface by engaging two contact probes across the surface of said substrate, said electrical bias being sufficient to cause an electrolysis reaction to occur at said corrosion site, andexposing said fluorescent dye to actinic radiation, whereby fluorescence is activated at the cathodic corrosion site.
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Abstract
A method of detecting a cathodic corrosion site on a metallized substrate comprises depositing molecules of a pH sensitive fluorescent dye adjacent a metallic surface of the substrate, the metallic surface having a corrosion site thereon characterized by a reduction of the hydronium ion to hydrogen (2H+ +2e- →H2). An electrical bias is then applied across the metallic surface, and the fluorescent dye is exposed to ultraviolet (UV) radiation, whereby fluorescence is activated at the cathodic corrosion site.
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Citations
11 Claims
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1. A method of detecting a cathodic corrosion site on a metallized substrate comprising the steps of:
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depositing a relatively thin film of molecules of a pH sensitive fluorescent dye adjacent a metallic surface of said substrate, said metallic surface having a corrosion site thereon characterized by a reduction of the hydronium ion to hydrogen (2H+ +2e- →
H2) in a moist ambient capable of supplying H+ ions,applying an electrical bias across said surface by engaging two contact probes across the surface of said substrate, said electrical bias being sufficient to cause an electrolysis reaction to occur at said corrosion site, and exposing said fluorescent dye to actinic radiation, whereby fluorescence is activated at the cathodic corrosion site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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