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Inherent corrosion

Q: Inherent corrosion resistance

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QuestionWhat is the minimum level of chromium required to give the steel almost complete corrosion resistance?

 

Red cross 3 wt% - incorrect, if you look on the diagram you will see that at 3 wt% there is still quite a significant amount of corrosion that can occur.  Try again.

Red cross 6 wt% - incorrect, the amount of corrosion that can occur is certainly less than if there were no chromium present;  however there is still too much to say that the steel has almost complete corrosion protection.  Try again

Red cross 9 wt% - incorrect, the amount of corrosion that can occur is certainly less than if there were no chromium present; however there is still too much to say that the steel has almost complete corrosion protection.  Try again

Green tick 12 wt% - correct, the level of corrosion has been reduced significantly by the addition of 12 wt% Cr, and any additional increase in Cr level has little effect on corrosion resistance.  A steel with greater than 12 wt% Cr in it is called a STAINLESS STEEL.

Red cross 15 wt%- incorrect, this level of Cr will give almost complete corrosion protection; however, it is not the minimum required.  Try again.

Red cross Try again.

    

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