Studying experimentally effect of processing parameters on performance of phytic acid conversion coating for improving corrosion resistance of magnesium

Section 1 of the full paper explains our experimental procedure. Analyzing the results presented in Figs.1 and 2, subsection 2.1 finally points out that: (1) the size of a crack increases with increasing thickness of phytic acid conversion coating; when the size of the crack is too big, the corrosion resistance of the conversion coating decreases; (2) consequently, only when the coating is relatively complete and dense can it possess good corrosion resistance. analyzing the results presented in Foig.3 and 4, subsection 2.2 points out that: (1) the crack on the coating becomes larger as the temperature goes up from 20°C to 60°C; the coating thus formed possesses better corrosion resistance; (2) when the conversion temperature is 80°C or 90°C, the size of the crack on the film decreases remarkably and the corrosion resistance of the film declines obviously. Analyzing the results presented in Figs.5 and 6, subsection 2.3 points out that, when the immersion time is too long, the corrosion resistance of the conversion coating worsens. Analyzing the results presented in Figs.7 and 8, subsection 2.4 points out that, as the pH value of phytic acid solution increases from 1 to 5, the size of the crack on the coating decreases, while the corrosion resistance of the coating first increases and then decreases.