Figure 25. Chemically cleaned exposed (left) and control (right) steel panels. 

 Surface corrosion is more irregular over exposed panels than over 

 control panels (268 days). (Same panels shown in Figures 21 and 24.) 



Figure 26. Chemically cleaned exposed (right) and control (left) aluminum alloy 



panels. Same panels shown in Figures 22 and 24. Severe pitting corrosion 

 and also crevice corrosion are present over exposed (right) panels. Very 

 light pitting and crevice corrosion were formed over control (left) panels 

 (268 days). 



27 



