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Can Rust Be Good? If It’s Black Oxide It Can Be!
If you’re talking about the red-orange growth that seemingly spontaneously appears on your lawn furniture, bike chain, or propane tank the answer is an emphatic NO! That red-orange compound is chemically speaking hydrated ferric oxide, Fe2O3, formed by exposure of iron to oxygen in the presence of water. However, iron when exposed to a highly alkaline salt bath at about 285 degrees F forms the other oxide of iron, namely ferrous oxide, Fe3O4, which is an aesthetically appealing black oxide or …
