Study On Modification And Corrosion Resistance Of Aluminum Tripolyphosphate

Physical modification and chemical modification of aluminum tripolyphosphate were carried out by gamma ray radiation and oxide respectively.The influence of modification process on the corrosion inhibition of aluminum tripolyphosphate was studied,and then apply it to the anti-corrosion coatings.First,radiation modification of aluminum tripolyphosphate were carried out by gamma ray radiation.The effects of gamma rays on the structure and properties were studied by XRD,FTIR,titration test,TG,DSC,SEM,EIS and so on.In the dose range investigated(0-150kGy),although the gamma ray on the aluminum tripolyphosphate crystal structure,thermal stability has no significant effect,but the neutralization titration test showed that the pH value of the aqueous solution of the modified sample was higher;Compared with the non radiative modification,the crystal transition absorption peak of 750 ? to 900 ? was disappeared in the modified samples.In the 3.5%NaCl suspension of aluminum tripolyphosphate,high radiation dose(100kGy,150kGy)modified aluminum tripolyphosphate corrosion inhibition performance improved significantly.Second,the aluminum tripolyphosphate and the basic oxides were added into the3.5%NaCl solution in order to obtain the suspension.The effect of Zinc Oxide,calcium oxide and Magnesium Oxide on the corrosion inhibition of aluminum tripolyphosphate was studied by AC impedance spectroscopy.Zinc Oxide,calcium oxide,magnesium oxide can significantly improve the short-term corrosion inhibition performance,but for a long time the corrosion inhibition performance was not significantly improved.In aluminum tripolyphosphate and two different oxides with different adding order of prepared suspension,can not only improve the corrosion inhibition performance of the short period,but also for long-term corrosion inhibition of performance improvement is obvious.Third,the aluminum tripolyphosphate modified by zinc oxide and silica,have a great improvement in performance,but the pH value of aluminum tripolyphosphate is inferior.For this reason,the present study was conducted further to improve the performance of ZnSi-ADTP by gamma irradiation.Effect of gamma irradiation on aluminum dihydrogentri-polyphosphate(ZnSi-ADTP)was studied in the dose range of 0kGy to 150 kGy by FTIR,XRD,TG,SEM,titration,EIS and other techniques.Although XRD and SEM results indicated that there were no significant effects on the crystal structure and the surface morphology of ZnSi-ADTP,the pH value of initial saturated solution increases with the increase of irradiation dose,the thermodynamic properties and EIS were changed greatly.Fourth,the effect of different factors of aqueous epoxy anti-corrosion coating performance was discussed.When the pigment ratio in 0.8,the mass ratio of the waterborne epoxy resin emulsion and waterborne epoxy curing agent in 100:8,ZnSi-ADTP as antirust pigment,the coating of combination property was the best.The indicators have reached the relevant requirements.