Magnesium alloy wire will inevitably form some defects in the process of production and casting. This article will introduce the defects in the process of casting magnesium alloy wire and the reasons for these defects.

A: Pores: magnesium alloy wire is a kind of hole on the surface or inside of the product caused by gas string in the solidification process of liquid metal. Most of these bubbles are round. Small pores do not affect the mechanical properties of the product, but large particles of bubbles will greatly reduce the anti-impact performance of the product, the surface of the product will be loaded with water in the surface treatment, spray paint or electroplating, because of the water in the hole swelling to the bubble.

B: Shrinkage hole: the hole on the surface or inside of the product caused by the reduction of the volume of the liquid during the solidification process. Shrinkage holes are often angular in shape and dendritic in appearance. Shrinkage holes on or near the surface of the product will bring problems to the subsequent processing. Like pores, shrinkage holes can be used to string liquid into the surface treatment, spray painting or electroplating to produce bubbles.

C: Intergranular corrosion: corrosion within the boundary between metal grains. Intergranular corrosion starts on the surface of the product, and then extends along the boundary of the particles to the inside of the product. High temperature and humid environment will accelerate the harm of intergranular corrosion, which will make the product expand, deform, and even crack and break seriously. At the same time, the mechanical properties will deteriorate, and intergranular corrosion can also cause electroplating bubbles. The reason is that the impurity elements such as lead, cadmium and tin in the alloy exceed the standard.