摘要
采用高温高压反应釜，通过调整介质温度与流速进行高温环烷酸腐蚀试验，研究了304不锈钢在高温条件的腐蚀行为。结果表明，酸值为1．1nagKOH／g时，304不锈钢在240～330℃的环烷酸介质中的腐蚀速率随着温度的升高呈现先增后减的变化规律，在275℃时腐蚀速率最大，为0．0308mm·a^-1。腐蚀速率与介质流速呈线性递增的关系，从流速为O．85m·s^-1时的0．0258mm·a^-1递增到流速为3．4m·s^-1时的0．0385mm·a^-1虽然304不锈钢平均腐蚀速率并不高，但在高温环烷酸环境中点蚀严重，且随着温度升高和流速增大点蚀加剧。故在高温环烷酸介质中不宜使用304不锈钢，对已有的装备应监护使用。
A high pressure autoclave was used to investigate the corrosion behavior of 304 stainless steel（SS） under the condition of high temperature naphthenic acid by adjusting different temperatures and different fluid velocityies. The results show that the corrosion rate of 304SS had a maximum when total acid number（TAN） was 1.1 mg KOH/ g at 240 ℃ -330 ℃. The maximum was 0. 030 8 mm ·a^-1 at 275 C. And the corrosion rate of this material increased linearly with the fluid velocity, from 0. 025 8 mm ·a^-1 at 0.85 m ·s^-1 tO 0. 038 5 mm·a^-1 at 3. 325 m ·s^-1. The results indicate that the average corrosion rate of 304S8 was not high, but it had serious pitting corrosion in the high temperature naphthenic acid environment, and the pitting corrosion intensified as the temperature and the veloeity increased. Therefor 304SS should not be used in the high temperature naphthenie acid medium, and the existing equipment should be used with guardianship.
出处
《腐蚀与防护》
CAS
北大核心
2013年第11期977-980,984,共5页
Corrosion & Protection
基金
国家自然科学基金(51175204)
关键词
304不锈钢
环烷酸
腐蚀
温度
流速
304 stainless steel
naphthenic acid
corrosion
temperature
fluid velocity
