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11.
As novel dark red pigment,sodium manganese phosphate,NaMnPO4,imitated with Natrophilite,was synthesized by heating at various conditions.The heating temperature... 相似文献
12.
《腐蚀工程科学与技术》2013,48(6):435-441
AbstractThis paper aims to evaluate the ability of phosphate pretreatments applied on steel rebars to hinder the corrosion reinforcements using synthetic pore electrolyte and mortar contaminated by chloride ions. The electrochemical behaviour of the pretreated substrate was assessed by corrosion potential, polarisation resistance and electrochemical impedance spectroscopy measurements. The results have demonstrated that the treatment of the rebar by immersion in the Na3PO4 (0·5M) solution favours the formation of a passive layer on the steel rebar surface, which increases the resistance to corrosion initiation up to 0·3M Cl– instead of 0·1M Cl– without treatment. The pretreatment also provides enhancement of corrosion protection of the steel rebar in mortar. The evolution of the impedance spectra in function of chloride concentration is in a fairly good agreement with the results obtained from RP measurements. 相似文献
13.
《金属精饰学会汇刊》2013,91(3):167-171
AbstractThe corrosion and protection characteristics of phosphate coatings formed in a phosphating solution containing mainly ZnO, H3PO4 and NaF, using Y2O3 as an additive, were investigated through SEM, polarisation curves and EIS diagrams. The results show that the corrosion protection of phosphate coatings has been improved when Y2O3 is added to the phosphating solution, making the free corrosion potential shift to the positive direction and causing the corrosion current to decrease. The protection ability of phosphate coatings depends mainly on their barrier performance. The phosphate coatings formed in the phosphating solution with 10 and 20 mg L–1 Y2O3 have finer crystal structures and smaller porosity; therefore, they exhibit better corrosion resistance and adhesion properties than those without Y2O3 and with 40 mg L–1 Y2O3. 相似文献