Abstract
Current density mapping was used to locate and monitor the early stages of corrosion at dejects on painted surfaces in solution. Principles of the technique and methods of analysis were reviewed, and the effects of different scribing techniques were investigated. Results for painted zinc and aluminum-zinc alloy coated steel surfaces showed corrosion occurred initially at localized sites on the exposed zinc in both dilute chloride and sulfate solutions and when zinc was galvanically coupled to or isolated from steel. Current density mapping was shown to locate corrosion-susceptible defects on painted roll-formed materials that were not readily discernible optically.
Original language | English |
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Pages (from-to) | 163-168 |
Number of pages | 6 |
Journal | Corrosion |
Volume | 52 |
Issue number | 3 |
DOIs | |
State | Published - Mar 1996 |
Externally published | Yes |
Keywords
- Alloying
- Aluminum
- Chloride
- Coatings
- Current density
- Defects
- Galvanic couple
- Mapping
- Sulfate
- Temperature
- Zinc