Questions: Chromium and carbon are responsible for creating the protective layer on stainless steels. True False

Solution Steps

Stainless steel is known for its corrosion resistance, which is primarily due to the formation of a passive layer on its surface. This passive layer is mainly composed of chromium oxide, which forms when chromium in the steel reacts with oxygen in the environment.

Chromium is the key element responsible for the formation of the protective oxide layer. It must be present in sufficient quantities (at least 10.5% by weight) to ensure the formation of a stable and continuous chromium oxide layer that protects the steel from corrosion.

Carbon, on the other hand, is not directly responsible for the formation of the protective layer. Instead, it can affect the properties of stainless steel, such as hardness and strength. However, excessive carbon can lead to the formation of chromium carbides, which can deplete chromium from the matrix and reduce corrosion resistance.

Final Answer