本文介绍一种Sr复合盐长效变质剂。试验结果表明,Al-Si合金用Sr复合盐变质,其金相组织与Na盐变质所得的金相组织相仿,机械性能高于钠盐变质的合金。对Al-Si共晶合金变质有效时间可达4~6小时,亚共晶合金变质有效时问为2~4小时,重熔仍具有变质效果。 This article describes a Sr complex salt long-acting modifier. The experimental results show that Al-Si alloy is deteriorated by Sr composite salt. The microstructure of the Al-Si alloy is similar to that of the Na salt modification. The mechanical properties of the Al-Si alloy are better than that of the Na salt modification alloy. For Al-Si eutectic alloy metamorphic effective time up to 4 to 6 hours, hypo-eutectic alloy metamorphic effective time asked for 2 to 4 hours, remelting still metamorphic effect.