Study on the Retardation of Hydrochloric Acid Fume

A novel kind of the hydrochloric acid fume retardant was prepared with the long chain fatty alcohols and the nonionic surfactants in this work. The results showed that the film-forming materials could spread as monolayers quickly and spontaneously at the hydrochloric acid surface. The mixed monolayers exhibited considerably larger effective resistance to hydrochloric acid fume when the concentration of the retardant was 7.5 g/m², and it could retard hydrochloric acid fume almost completely even lasting for 10 h. Moreover, the environmental factors, such as the temperature, the wind force and the dust, were also discussed in detail, and the results showed that the retardant had a good anti-interference ability. Also, microstructures of the mixed monolayers were obtained by an atomic force microscopy (AFM). From AFM images, it could be found that the mixed monolayers gave a film with a less-defective and relatively flat surface.