Zinc die casting have porosity is often related to raw materials or smelting process.
The main component of the gas is hydrogen in liquid zinc, which accounts for about 85% of the total amount of gas. Melting temperature is higher, the solubility of hydrogen in liquid zinc is higher, but the solubility of hydrogen in solid zinc is very low, so the formation of hydrogen in the solidification process is the porosity.
Source of hydrogen: water vapor in the atmosphere, liquid metal absorbed from the moist air. Zinc die casting raw material itself contains hydrogen, alloy ingot surface is moist, recycled scrap is dirty and greasy. The tools and flux is moist.
The above article from KENOS official website, reproduced please specify. kenosblog1603
The main component of the gas is hydrogen in liquid zinc, which accounts for about 85% of the total amount of gas. Melting temperature is higher, the solubility of hydrogen in liquid zinc is higher, but the solubility of hydrogen in solid zinc is very low, so the formation of hydrogen in the solidification process is the porosity.
Source of hydrogen: water vapor in the atmosphere, liquid metal absorbed from the moist air. Zinc die casting raw material itself contains hydrogen, alloy ingot surface is moist, recycled scrap is dirty and greasy. The tools and flux is moist.
The above article from KENOS official website, reproduced please specify. kenosblog1603
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