Abstract
The reaction of Al upon hydrochloric acid solution (1.5-4N) was investigated based upon the reaction velocity theory. The result is as follows:
1. Al reacts on and dissolves in hydrochloric acid solution according to the following chemical equation:
Al+3HCl=AlCl3+3/2H2
2. The dissolving reaction of Al in hydrochloric acid solution consists of the stages of primary and secondary dissolution. The former can be shortened or eliminated by a suitable pretreatment, and the latter becomes the main-part of the reaction.
3. In 1.5-4N hydrochloric acid solution the first order reaction of Al will take place, under which the following reaction velocity equation will hold:
d(Al)/dt∞dV/dt=3.11×102[HCl]⋅S⋅e-8200/1.986T(V∞-V)(see equation 5, page 357).
From this equation, we can determine the life of Al in hydrochloric acid.
4. The activation energy is 8200cal/mol; from this figure the reaction is regarded as a diffusion reaction.
