Inhibiting effect of some dyes on corrosion of aluminum and aluminum-alloys in hydrochloric acid

The inhibiting effect of some dyes [fast blue R.R. salt, fast blue B.B. salt, fuchsine base, crystal violet and rhodamine G 6] on the corrosion of pure aluminum and two types of its alloy [Al-Mg-Mn and Al-Mg] in 0.5M HCI has been studied using potentiodynamic polarization method and open-circuit potential measurement.Comparison of the inhibitive efficiencies of different dyes in 0.5M HCI for pure Al has shown the following order Crystal violet

Corrosion and galvanic corrosion of steels in distilled, tap and sea water

Galvanic interaction of 3 G-steels with titanium has been studied in distilled, tap and sea water using current and weights loss measurements for 7 days. The results showed that Ti was a very corrosive resistant material in these solutions and this behavior was not affected by coupling with the different steels. Potentiostatic method was also used to study the effect of chloride on the corrosion behavior of the above steels in the 3 solutions at different temperatures

Inhibition and acceleration of Aluminium and Aluminium-Magnesium corrosion in Hydrochloric acid

The inhibition of the corrosion of aluminium and A1-Mg alloys in 0.1 M HCI was investigated with regard to the chemical species [complexes, compounds] possibly formed with aluminium ions. As a basis for comparison, some inhibitors such as sodium chromate, citrate and acetate were used. Inhibition efficiencies were measured for 14 days immersion with linear polorization measurements. Only chromate gave nearly complete protection for A1 and A1-Mg alloys. Citrate gave accelerated corrosion at certain concentration. These results are interprated in the term of the species that are formed with the aluminium ions