烟气脱硝用尿素水解装置关键部件用候选材料的腐蚀行为
Corrosion Behavior of Candidate Materials Used for Critical Parts of Urea Hydrolysis Equipment in Gas Denitrification
摘 要
在模拟烟气脱硝的尿素水解环境中研究了尿素水解装置关键部件用候选材料316L不锈钢、316Lmod不锈钢、HR3C不锈钢、Inconel718合金和TC4合金的腐蚀行为。结果表明：316L与316Lmod不锈钢在腐蚀初期均出现不同程度的溶解腐蚀，腐蚀后期316L不锈钢的腐蚀产物沉积量增多，腐蚀产物出现大面积剥落，腐蚀过程以点蚀为主，而316Lmod不锈钢则以均匀腐蚀、腐蚀产物沉积为主；TC4合金、Inconel718合金与HR3C不锈钢均具有比316L和316Lmod不锈钢更好的耐蚀性能；TC4钛合金表面形成一层约3 μm厚的致密钛氧化层，腐蚀过程中水热合成了Cr2O3和Fe2O3产物；Inconel718合金在腐蚀初期出现少量溶解腐蚀，后期以大量氧化物沉积为主；HR3C不锈钢在腐蚀初期发生了明显的晶间腐蚀，之后以腐蚀产物沉积为主。
腐蚀行为
氧化物沉积
urea hydrolysis
corrosion behavior
oxide deposition
Abstract
Corrosion behavior of candidate alloys such as 316L stainless steel, 316Lmod stainless steel, HR3C stainless steel, Inconel718 alloy and TC4 alloy used for critical parts of urea hydrolysis equipment in gas denitrification was studied in simulated urea hydrolysis environment. The results show that different degree of dissolve corrosion was happened for 316L and 316Lmod stainless steel at the initial stage. In the following corrosion stage, corrosion product deposition increased and a large surface of corrosion products exfoliation were observed on 316L stainless steel which was mainly pitting corrosion, while uniform corrosion and deposition of corrosion products dominated the corrosion process for 316Lmod stainless steel. TC4 alloy, Inconel718 alloy and HR3C stainless steel showed a better corrosion resistance compared with 316L and 316Lmod stainless steel. There was a dense titanium oxide layer with 3 μm in thickness formed on surface of TC4 alloy and mixed oxides consisting of Cr2O3 and Fe2O3 formed by hydrothermal synthesis reaction were the main corrosion products. A small amount of dissolve corrosion was observed on Inconel718 alloy at the initial stage and in later stage deposition of corrosion products dominated the corrosion process. Intergranular corrosion was clearly observed in HR3C stainless steel at the initial stage and deposition of corrosion products dominated the following corrosion process of HR3C stainless steel.
中图分类号 TG132.3 DOI 10.11973/jxgccl201707002
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51301130）；华能集团科技专项项目（HNKJ15-H04、HNKJ15-H02）
收稿日期 2016/5/12
修改稿日期 2017/6/8
网络出版日期
作者单位点击查看
备注鲁金涛(1984-),男,河北唐山人,高级工程师,博士
引用该论文: LU Jintao,ZHANG Bo,HUANG Jinyang,YANG Zhen,XU Hongjie. Corrosion Behavior of Candidate Materials Used for Critical Parts of Urea Hydrolysis Equipment in Gas Denitrification[J]. Materials for mechancial engineering, 2017, 41(7): 6～12
鲁金涛,张波,黄锦阳,杨珍,徐宏杰. 烟气脱硝用尿素水解装置关键部件用候选材料的腐蚀行为[J]. 机械工程材料, 2017, 41(7): 6～12
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【6】惠润堂,韦飞,闫世平,等.国产首套尿素水解装置在大型火电厂的工业应用及技术优化[J].中国电力,2014,47(7):150-155.
【7】杜存臣. 奥氏体不锈钢在工业中的应用[J]. 化工设备与管道,2003,40(2):54-57.
【8】丁文炎,邵羽,王建勇,等. 尿素级超低碳奥氏体不锈钢钢管的研制及应用[J]. 钢管,2013, 42(5):35-40.
【9】艾文山,左景伊,吴玖. 氮改善00Cr18Ni5Mo3Si2双相不锈钢应力腐蚀破裂性能的机制[J]. 中国腐蚀与防护学报,1991,11(1):9-16.
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【13】吴剑,李晋,张静江. 尿素生产装置中高压冷凝器的腐蚀研究[J]. 中国腐蚀与防护学报,1986,6(3):235-240.
【14】张述林,李敏娇,王晓波,等. 18-8奥氏体不锈钢的晶间腐蚀[J]. 中国腐蚀与防护学报,2007,27(2):124-128.
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