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本工作采用电化学技术与慢应变速率应力腐蚀试验技术相结合的试验方法,研究了大化肥生产中的二氧化碳吸收塔和再生塔用16MnR钢母材及焊接接头在沸腾的碳酸钾液中及苯菲尔液中的电化学行为和应力腐蚀开裂行为。得出16MnR钢在沸腾的碳酸钾溶液中发生应力腐蚀开裂的电位区间大致在-700～-900mV的范围内;而在V_2O_5含量为0.5％的沸腾苯菲尔液中没有应力腐蚀开裂敏感性。V_2O_5既缓蚀了16MnR钢在沸腾碳酸钾溶液中的均匀腐蚀,又使该体系脱离了发生应力腐蚀开裂的电位区间。据此提出,在二氧化碳吸收塔和再生塔的设备制造中,为防止应力腐蚀开裂而进行的热处理不是必须进行的工艺过程。
In this work, a combination of electrochemical technique and slow strain rate stress corrosion testing technique was used to study the effects of the combination of 16MnR steel base metal and welded joints on carbon dioxide absorption tower and regeneration tower in large fertilizer production in boiling potassium carbonate solution and benzene Electrochemical Behavior and Stress Corrosion Cracking Behavior in Phil Liquids. The results show that the potential range of stress corrosion cracking of 16MnR steel in boiling potassium carbonate solution is in the range of -700 ~ -900mV, while there is no stress corrosion cracking sensitivity in the boiling solution of Fe 2 O 5 with 0.5% V 2 O 5 content. V 2 O 5 not only corrodes the uniform corrosion of 16MnR steel in boiling potassium carbonate solution, but also makes the system break away from the potential range where stress corrosion cracking occurs. Accordingly, it has been suggested that the heat treatment to prevent stress corrosion cracking in the manufacture of carbon dioxide absorption towers and regeneration towers is not an essential process.