Gamma-irradiation effect on properties of aluminium dihydrogen tri-polyphosphate

Weiqiang Song, Qinghuan Song, Longchao Wu, Lantao Yang


Effect of gamma irradiation on properties of aluminium dihydrogen tri-polyphosphate (ADTP) was studied in the dose range of 0kGy to 150kGy by X-ray diffraction (XRD), thermal analysis, acid-base titration, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Although XRD and SEM results indicated that there were no significant effects on the crystal structure and the surface morphology of ADTP, thermal analysis revealed that the crystal transition of Al(PO3)3 from Type-B to Type-A did not occur at high temperature in irradiated ADTP. EIS results showed that high-dose gamma irradiation (100kGy and 150kGy, 60Co) improved the corrosion inhibition ability of ADTP on tinplate steel. SEM was used to investigate the surface of tinplate steel panels after immersing in ADTP extract for 69 hours, and revealed that plenty of slices were formed on the surface. The slices were attributed to the formation of Fe2P3O10. The interslice gaps may be the reason for the weaker corrosion resistance of ADTP compared with some toxic pigments containing lead and chromium. Generally speaking, gamma irradiation had improved the corrosion resistance of ADTP at high dose


X-ray diffraction; thermal analysis; electrochemical impedance spectroscopy; scanning electron microscopy

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