Corrosion behavior of 304L stainless steel in a B-Li coolant for a nuclear power plant

Abstract

The corrosion behavior of 304L stainless steel (SS) in B/Li solutions with different concentrations was studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurement. The results showed that the oxide film formed at high temperature and a high pressure water is mainly composed of magnetite and the oxide film formed in a 1000 mg/L B and 2.2 mg/L Li solution is thicker than that in a 2000 mg/L B and 3.5 mg/L Li solution. The outer surface oxide particles' size and inner film uniformity is affected by the B/Li concentration. The pitting potential and the modulus of impedance of the 304L in 1000 mg/L B and 2.2 mg/L Li solutions were higher than the 2000 mg/L B and 3.5 mg/L Li solutions. The solution of 1000 mg/L B and 2.2 mg/L Li is beneficial for the corrosion resistance, because of forming a stable oxide film on the 304L surface.

Stress Corrosion Cracking Behavior of TP 439 and 690 TT under Film-Forming Amine Environment

“…The published literatures study the physical and chemical properties of FAs [4][5][6][7], dissociation constant and distribution coefficient [8,9], reaction mechanism and influence on metal materials [10][11][12][13][14][15][16], the influence on the chemical parameters in the loop such as pH and conductivity [17][18][19][20], the decomposition products [18,21], the influence on the heat exchange performance [22][23][24][25][26], and the influence on the online chemical instrument detection [27]. However, there is not much research work on the stress corrosion cracking behavior of materials at sensitive locations in the FA environment [28].This article is conducting related research work, using a commercial FA that has been applied on the secondary circuit side of a PWR nuclear power plant for evaluation.…”