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42 7. Edge Geometry 9.2. Aluminum is more tolerant to chloride contamina- tion than zinc TSMC in corrosion tests, showing bet- 7.1. A smoother edge promotes more uniform coating ter overall corrosion performance, but it has more coverage at the edge. tendency to blister. 7.2. No differences in corrosion performance caused by 9.3. The presence of defects has not affected the perfor- edge geometry have been observed to date. mance of the coatings on contaminated panels to date. 8. Defects SUGGESTED RESEARCH Small narrow defects in the TSMC where the substrate has been exposed are protected by the galvanic behavior of 1. Initiate a study to examine the effects of grit angularity the TSMC. However, the TSMC cannot provide complete on RPC, RQ, adhesion, and performance of TSMCs; to cathodic protection to larger holidays. define acceptable limits of angularity; and to establish a standard for angularity. 9. Chloride Contamination 2. Continue to monitor the test panels currently in immer- sion and cyclic immersion testing at Corrpro's Ocean 9.1. Aluminum TSMC is sensitive to chloride contami- City facility. The testing should be continued until a nation on the metal surface, showing loss of adhe- clear difference is observed between the panels pre- sion at even the lowest level of contamination used pared by different processes, or for at least 5 years. A (5 g/cm2). On the basis of the adhesion results, zinc report should be prepared at the end of that period, TSMC was insensitive to chloride contamination up and changes should be made to the guide to TSMCs to the 10 g/cm2 used in this study. as appropriate.