Iranian Journal of Ceramic Science & Engineering
1- Saveh Branch, Islamic Azad University
2- Saveh Branch, Islamic Azad University , ab_najafi@iust.ac.ir
3- South Tehran Branch, Islamic Azad University
2- Saveh Branch, Islamic Azad University , ab_najafi@iust.ac.ir
3- South Tehran Branch, Islamic Azad University
Abstract: (185 Views)
Phosphate coatings are among the protective coatings that are used to increase paint adhesion, increase corrosion resistance, and together with oil to create wear resistance and facilitate the plasticity of parts. Nowadays, various industries try to improve the resulting properties by using multi-cationic phosphate coatings. In this research, the concentration of phosphate bath builders (compounds containing acid and compounds containing nitrate and nitrite), the effect of temperature and immersion time, and the effect of pH on the coating and microstructural properties of ternary zinc-nickel-manganese compounds were investigated. The created coatings were evaluated by measuring the effect of the surface activation agent in the activation bath, the ratio of total acidity to free solution, checking the unit weight of the coating surface, thickness, apparent density, uniformity and microscopic structure of the coating. The findings showed that the activation bath with basic composition titanium phosphate was optimized with a concentration of 1 g/lit, a time of 3 minutes at a temperature of 35-40 °C. The optimal composition of the phosphate bath includes 10 ml/lit phosphoric acid, 2 ml/lit nitric acid, 0.18 g/lit sodium nitrite, 0.8 g/lit sodium nitrate, 0.5 g/lit sodium fluoride and 0.3 g/lit is the active ingredient. The optimal operating conditions of the bath were obtained at a temperature of 55 °C, a time of 8 minutes, and a pH between 2.9 and 1.3. The X-ray diffraction pattern showed that the phases containing phosphate compounds were successfully formed for the coating on the substrate. The microstructure image along with the EDS pattern of the coating shows that zinc-nickel-manganese elements are sufficient for optimal use in industries that will be involved with corrosive environments.
Keywords: phosphate coating, three cations, zinc, nickel, manganese, corrosion resistance, paint adhesion
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