大家都知道,氯化铵水溶液是我国目前精铸中水玻璃型壳普遍采用的硬化液。它的性能直接影响到型壳的质量,如强度的高低、面层质量的好坏等,同时也直接影响到铸件的质量,所以生产中怎样控制氯化铵硬化液的性能是大家很关心的问题之一。为此,有的单位除了规定控制硬化液的浓度、温度和氯化钠的含量以外,还规定如下: We all know that ammonium chloride aqueous solution is currently China’s casting water glass shell commonly used hardening liquid. Its performance has a direct impact on the quality of the shell, such as the strength of the level of the surface quality is good or bad, but also a direct impact on the quality of the casting, so how to control the production of ammonium chloride hardening solution performance is of great concern One of the problems. To this end, some units in addition to the provisions of the control of the concentration of hardening fluid, temperature and sodium chloride content, but also provides the following: