Overflatepassivering

Overflatepassivering is a process used to protect metal surfaces from corrosion. It involves creating a thin, protective film on the metal's surface. This film acts as a barrier, preventing corrosive agents like oxygen and moisture from reaching the underlying metal.

Different passivation methods exist depending on the metal. For stainless steel, passivation often involves cleaning the surface and then exposing it to an oxidizing acid, typically nitric acid or citric acid. This process removes free iron particles from the surface and promotes the formation of a passive chromium oxide layer. For other metals like aluminum, anodizing is a common form of passivation that creates a thicker, more durable oxide layer.

The effectiveness of passivation depends on several factors, including the cleanliness of the metal surface before the process, the type and concentration of the passivating agent, the duration of the treatment, and the temperature. Proper passivation significantly extends the lifespan of metal components, making them suitable for use in harsh environments such as marine, chemical, and medical applications. Regular inspection and maintenance can help ensure the continued integrity of the passive layer.