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氢是铝合金中的一种最有害的杂质,它不仅仅影响工艺性能,而且还影响合金的使用性能。在评价合金的质量时,氢的含量是一项重要的指标,因此,在熔炼铸造过程中必须检查熔体的含氢量,以便控制合金的质量。现在国内外使用的各种检测氢含量的方法和设备,都是以测定在真空负压下从铝熔体析出的氢的压力来计算氢含量。测定氢时,在恒温下缓慢地在坩埚内合金熔体的上方造成负压,直到从熔体中析出氢气为止。根据文献,在液体铝合金中溶解的气体
Hydrogen is one of the most detrimental impurities in aluminum alloys, which not only affects the process performance, but also affects the performance of the alloy. In evaluating the quality of the alloy, the hydrogen content is an important indicator. Therefore, the hydrogen content of the melt must be checked during the smelting process in order to control the quality of the alloy. Various methods and apparatus for detecting hydrogen content used at home and abroad now calculate the hydrogen content by measuring the pressure of hydrogen which is precipitated from the aluminum melt under a vacuum negative pressure. When hydrogen is measured, a negative pressure is slowly applied at a constant temperature above the alloy melt in the crucible until hydrogen gas is separated from the melt. According to the literature, dissolved gases in liquid aluminum alloys