抄録
Corrosion behavior of various metal tubes was studied under pressure of 40 MPa and at temperatures of 400 °C by means of supercritical water quick-heating and rapid-quenching micro-reaction system. The reaction tubes for nitric acid corrosion test were made by SUS316, Inconel 625, and double-layered Inconel 625 with titanium inner layer tube. The concentration of various metals in the effluent were monitored by ICP-AES.
Surface observations for the reaction tube are archived by optical microscopy. The concentration of the metals in the effluent depend on the reaction time decreased exponentially, because of the growth of corrosion-resistant metal oxide layer. Quite low corrosion rate against nitric acid was observed by titanium in the double-layered tube.
However, an end-of-tube elusion was observed in the case of the Inconel supported titanium tube.
