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Die-cast zinc alloy products have a wide range of applications, but due to the zinc alloy have low chemical stability, many zinc alloy die-casting parts require electroplating treatment to enhance anti-corrosion performance, and improve the appearance and value of the product at the same time. The most common combination electroplating with copper/nickel/chromium and various colored plating. Common zinc alloy die casting plating products include faucets, zipper pulls, belt buckles, buttons, luggage buckles, toys, locks, lampshade decorations and door handles, etc.

The segregation phenomenon in the production process of zinc alloy ingots is caused by the different densities and solidification sequences of metal elements in the alloy and the different distribution of each element in the alloy ingot during solidification. This normal physical phenomenon does not affect the production of die casting, because after the alloy ingot is melted into a liquid state, the elements are evenly distributed. However, taking too few samples or improperly area them can skew the test results compared to laboratory tests. Therefore, when we test the composition of alloys, the correct sampling method becomes important. As a result, there is a set of standard sampling methods for zinc alloy ingots in the world, such as the British EN12060. Below, we compare the effects of different sampling methods on the test results, with the test results taken by the standard method as the criterion.