How to remove rust from aluminium alloys

How to remove rust from aluminium alloys

Many people are asking how to remove rust from aluminium alloy, today we will explain how to remove rust from aluminium alloy when it is rusty.

1、Alkali solution to remove rust: The rust of aluminium alloy is mainly the oxide film on the surface, sometimes there is also white powder, also known as white rust, the method of removal is mainly in alkaline chemical solution to fade away. This can be done according to the type of material and the surface of the aluminium workpiece. When there is very little oil on the surface of the aluminium workpiece, the oil removal and the film removal can be treated together. If the oil on the surface is very thick, then the oil should be removed first and then the oxide film should be removed, otherwise it will cause the oil removal and film removal to be incomplete, affecting the subsequent process and possibly reducing the quality of the surface treatment.

2. Pickling and rust removal: When pickling and rust removal is used for aluminium alloy workpieces, the workpiece must be thoroughly degreased to ensure the quality of rust removal. This is because if the oil removal is not clean, it will affect the contact and reaction between the acid and the oxide film causing incomplete or inefficient rust removal and long time. With rust removal by pickling, the loss of substrate material is small and the operation is easily controlled. The surface after descaling is in a semi-glossy state without the need for ash removal treatment and can be directly coloured or anodised, but if electroplating or chemical plating is required, processes such as zinc dipping are required.