According to the characters of morphology and composition, the uncovered area ‘‘a’’ could be confirmed as a part of original surface of wire, meanwhile the area ‘‘b’’ is the oxide layer visually traced as a coating substance growing from area ‘‘a’’.
According to the characters of morphology andcomposition, the uncovered area ‘‘a’’ could be confirmed as a partof original surface of wire, meanwhile the area ‘‘b’’ is the oxidelayer visually traced as a coating substance growing from area ‘‘a’’.