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通过电化学动电位扫描技术,采用正交试验法,研究了溴化锂(LiBr)吸收式热泵用管材316L不锈钢在热网水中的耐蚀性,建立了316L点蚀电位关于热网水温度、Cl-浓度和p H值三因素数学模型。通过腐蚀失重和电化学极化法进行了316L不锈钢在吸收器LiBr溶液中的点蚀性能研究。结果表明:温度与Cl-浓度对316L点蚀电位影响负相关,而p H值对其影响正相关,且各因素影响的显著程度为p H值>温度>Cl-浓度。吸收器条件下316L不锈钢的腐蚀速率仅为0.78μm/a,其表面点蚀坑多但较浅,且分布较均匀;但是316L点蚀电位Eb低于其氧平衡电位φ较多,点蚀仍可能发生。
The electrochemical corrosion resistance of 316L stainless steel pipe in hot water was studied by electrochemical potentiodynamic scanning and orthogonal test. The corrosion resistance of 316L pitting corrosion potential in hot water was investigated. Cl- Concentration and p H three-factor mathematical model. The corrosion behavior of 316L stainless steel in LiBr absorber was investigated by corrosion loss and electrochemical polarization. The results show that temperature and Cl-concentration have a negative correlation with the pitting potential of 316L, while p H has a positive effect on the pitting potential. The significance of each factor is p H> temperature> Cl-concentration. The corrosion rate of 316L stainless steel is only 0.78μm / a under the condition of absorber, but its surface pitting corrosion pit is more but shallow, and the distribution is more uniform. However, the pitting corrosion potential Eb of 316L is lower than the oxygen equilibrium potential φ, It may happen.