In order to expand the thickness of the natural layer of oxide located on the surface of metal objects, we use a process called anodising. Anodising involves electrolytic passivation. This increases corrosion resistance and wear resistance too.
It's important that all the wrought alloys are cleaned before the process begins. To do this, we either use a hot soak cleaner or a solvent bath. The next step consists of passing a direct current through an electrolytic solution. While this is happening, the object serves as the positive electrode (the anode). As a result, the outer layer of the metal will grow. We're able to create a build-up of oxide, because hydrogen at the negative electrode and oxygen at the surface of the anode are released by the current.
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