What are the defects of magnesium alloy die casting? Surface spray paint can produce what bad? How to solve it?

There are many defects in die casting, which can be roughly divided into two categories, one is poor size, the other is poor surface state. Poor size is generally physical properties, such as more material, lack of material, cracks, heavy flow marks, poor flatness and so on. Poor surface condition is usually chemical, such as oxidation, black spots, white spots, etc.

Surface spray paint produce adverse, this problem can't simply, because before spray paint and chemical film this procedure, his quality is closely related to paint this process, the chemical film-forming process also had a lot to do with die casting quality, the quality of these processes are complementary to each other, general testing spray paint quality is nothing more than two aspects, one is the appearance, One is the performance, the appearance is very intuitive, such as color difference, flow marks, flatness and so on, and the performance is corrosion resistance, bonding force and so on. Bad also mainly is these two aspects bad.

As for the bad solution is not a word can be stated, write a book is, also need to LZ had a system for the whole process of understanding and personal experience, summed up slowly, because have a connection between each working procedure, so also want to know, for different artifacts, affirmation process is not the same, and because some of the industry upgrading, So the size of the workpiece is always change, die casting conditions can only slowly to adjust, and procurement of raw materials, has a great influence on the quality standard of the mould and die casting machine also, the use of chemical film-forming drugs and coatings will have great influence, so a problem don't worry, and each supplier of communication, waiting for you all the problems meet again, and had been solved one by one