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前 言 在熔模精铸水玻璃制壳工艺中,通常以氯化铵作为硬化剂。但氯化铵在硬化过程中会挥发出大量氨气,恶化劳动条件,并对设备有严重的腐蚀作用。 根据我厂地处沿海的特点,采用盐卤及氯化镁比较合适,几年来生产实践表明,效果良好,工艺稳定,质量保证。 一、盐卤和氯化镁的性质及硬化原理 盐卤的主要成份是氯化镁,并含有少量硫酸镁、氯化钠、氯化钾等杂质,其组成如
Preface In investment casting water glass shell process, usually with ammonium chloride as a hardener. However, ammonium chloride in the hardening process will emit a large amount of ammonia, deterioration of working conditions, and the equipment has a serious corrosive effect. According to the characteristics of our factory located in the coastal areas, the use of salt brine and magnesium chloride is more appropriate, the past few years of production practice shows that the effect is good, process stability, quality assurance. First, the nature of brine and magnesium chloride and hardening principle Brine is the main component of magnesium chloride, and contains a small amount of magnesium sulfate, sodium chloride, potassium chloride and other impurities, such as the composition of