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		#8 | 
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			 Member 
			
			
			
			Join Date: Apr 2010 
				
				
				
					Posts: 672
				 
				
				
				
				
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			Hello 
		
		
		
		
		
		
		
	With the little that is of chemistry, I know that there is no inactive oxide. Even the black oxide (ferrous-ferric) of the blued, continues to act if it does not receive a conservation treatment. What happens is that it continues its action below the surface of the metal, and its action is not seen, and it is very slow Fernando K  | 
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