Scaling and electrochemical corrosion behavior of 304 stainless steel pipes in a simulated geothermal water environment
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摘要: 基于地熱水輸送過程中金屬管道材料出現的腐蝕結垢問題,研究了模擬地熱水(我國中部平原地熱水的環境條件)中304不銹鋼管材的結垢和電化學腐蝕行為.結果表明,304不銹鋼管在模擬地熱水環境中的結垢過程分為結晶成核和晶核生長兩個階段,結晶成核階段消耗結垢離子的速度比晶核生長階段更快,304不銹鋼管道表面結垢層的微觀形貌為不規則的"稻草"狀,地熱水溫度的變化促進了304不銹鋼材料在模擬地熱水中的點蝕敏感性,其表面鈍化膜的保護性也隨地熱水溫度的升高而降低.Abstract: Based on the universal problem of steel pipes' corrosion and scaling in the transportation of geothermal water, the environmental conditions of geothermal water in the Chinese central plains was simulated to study the scaling and electrochemical corrosion behavior of 304 stainless steel pipes. The experiments results indicated that the scaling process of 304 stainless steel pipes in the simulated geothermal water was divided into two states, one was the nucleus-forming state, and the other was the nucleus growth state. The reducing rate of scaling ions in the nucleus-forming state was more than that in the nucleus growth state. The microcosmic appearance of scaling was straw-like abnormity. In addition, the change in temperature of geothermal water could accelerate 304 stainless steel's sensitivity of pitting corrosion, and the protective performance of 304 stainless steel's passive film decreased as the temperature of geothermal water increasing.
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Key words:
- stainless steel pipe /
- geothermal water /
- scaling /
- corrosion
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