XPSによる塗布型クロメートの乾燥温度による組成変化の解析

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The dependence of drying temperature on changes in the composition of dry-in-place type chromate composed of Cr3+, Cr6+ and PO43-, has been investigated based on the results of thermal analysis assuming its drying process at actual application.Using a differential thermal analysis, an endothermic reaction was observed between 85°C and 200°C, while an exothermic reaction peaking at 300°C was observed between 200°C and 400°C.Further, the influence of these endothermic and exothermic reactions on the composition of dry-in-place type chromate has been investigated by XPS analysis.The thermal reaction has been also analyzed by the separation of chromate into water-insoluble constituents and soluble constituents, assuming the participation of water in the actual corrosion environment.The water-insoluble constituents form the polymer structures with Cr3+, Cr6+ and PO43- after endothermic reaction.In the exothermic reaction following the endothermic reaction, decrease of Cr6+ and increase of Cr3+, were caused by a reduction of deoxidization.It is considered that Cr3+, which is produced by a reduction of deoxidation, forms CrPO4.No composite difference is discernible in water-dissoluble constituents before and after the endothermic reaction, and they were composed of CrO3, CrPO4, Cr2O3 and Cr(OH)3·nH2O.The composition after the exothermal reaction is a mixture of CrO3 and small amounts of Cr2O3 and Cr(OH)3·nH2O. CrPO4 was not detected in this case.It is concluded that increase in PO43- fixed in water-insoluble constituents follows the increase in Cr3+ caused by a reduction of deoxidization.
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XPSによる塗布型クロメートの乾燥温度による組成変化の解析

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