When rust forms on steel, it’s because oxygen has combined with the steel to create iron oxide.
Iron oxide, the main component of rust, is black. The black oxide layer will slowly corrode over time, but it will protect the underlying steel from more severe corrosion. It does, however, offer some protection against corrosion. The process involves submerging the parts in a vat of hot black oxide solution, which creates a hard and durable finish. Is black oxide safe?īlack oxide is a safe and effective finish for stainless steel, as long as it is performed by a reputable black oxide supplier. There are a variety of other factors which impact this oxidation process as well. The color can vary depending upon how long it has been exposed to air and/or water and at what temperature. When oxidized, the oxide that forms on stainless steel is black. In some cases, this oxide layer can be so thick that it obscures the underlying metal entirely. This oxide layer can be colored from light brown to black, and it forms as a protective barrier against further corrosion. The blackening of steel is a result of the formation of an oxide layer on the surface of the metal. The black oxide finish provides protection against corrosion. Other factors can contribute to this phenomenon such as heat treating and chemical composition. The black color on stainless steel is typically the result of a discoloration process called “passivation” – an oxidation reaction that occurs between metal and oxygen in water or air to create compounds such as magnetite, FeO(OH). But if you’re having trouble getting rid of the rust spots, you may need to take your sink to a professional to determine the cause. In most cases, the discoloration can be removed with a mild abrasive such as baking soda or Bar Keepers Friend. If your stainless steel is turning black, it’s probably because of one of these factors. Has scratches on its surface that trap moisture under the metal. Is frequently used for hot water or acidic cleaning products. Is close to heat sources such as the stovetop or dishwasher. But stainless can develop rust spots, especially if your sink: Stainless steel is a popular material because it doesn’t corrode and break down easily like other metals. Useful Video: How to Blacken Stainless Steel, Black Oxide Patina.How can you tell if metal is stainless steel?.Why is my stainless steel turning black?.
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