为了探究低氯离子含量（0.01%~0.05%,质量分数）对熔盐与金属材料腐蚀过程的影响,该文采用失重法研究316L不锈钢与氯离子质量分数为0.01%、0.03%、0.05%的混合硝酸盐的腐蚀行为。结果发现,在经过360 h的腐蚀实验后,316L不锈钢在氯离子质量分数为0.03%的熔盐中具有最小的失重量,其为0.4381 mg/cm2。采用SEM、EDS、XRD等方法对316L不锈钢表面形貌进行分析,结果表明,在添加氯离子后不锈钢的腐蚀产物中出现Ca（OH）2,在Ca（OH）2的形成过程会消耗氢氧根离子,从而降低了不锈钢失重量。
Abstract
In order to explore the influence of molten salt with low chloride ion content （0.01%-0.05%,mass fraction） on the corrosion process of metal materials. By means of weight loss method, the corrosion behavior of 316L stainless steel in mixed molten salts with chloride ion mass fraction of 0.01%, 0.03% and 0.05% was studied. The results show that the minimum weight loss of 316L stainless steel in molten salt with chloride ion mass fraction of 0.03% is 0.4381 mg/cm2 after 360 h of corrosion test. The surface morphology analysis by SEM, EDS and XRD test showed that Ca（OH）2 appears in the corrosion products of stainless steel after adding chloride ions.During the formation of Ca（OH）2 mayhydroxyl ion are consumed, thus reducing the weight loss of stainless steel.
关键词
太阳能热发电 /
腐蚀 /
硝酸盐 /
不锈钢 /
氯离子 /
X射线衍射谱图
Key words
solar thermal power generation /
corrosion /
nitrates /
stainless steel /
chloride ion /
X ray diffraction spectrum
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参考文献
[1] GROSU Y, BONDARCHUK O, FAIK A.The effect of humidity, impurities and initial state on the corrosion of carbon and stainless steels in molten HitecXL salt for CSP application[J]. Solar energy materials and solar cells,2018, 174: 34-41.
[2] 吴玉庭, 任楠, 马重芳. 熔融盐显热蓄热技术的应用与研究进展[J]. 储能科学与技术, 2013, 2(6): 589-591.
WU Y T, REN N, MA C F.Research and application of molten salts for sensible heat storage[J]. Energy storage science and technology, 2013, 2(6): 589-591.
[3] NISSEN D A, MEEKER D E.Nitrate/nitrite chemistry in NaNO3-KNO3 melts[J]. Inorganic chemistry, 1983, 22(5): 716-721.
[4] 肖扬, 丁柳柳, 廖文俊, 等. 奥氏体不锈钢304、 316L和321在熔融硝酸盐中的耐腐蚀性[J]. 材料导报: 纳米与新材料专辑, 2016(1): 217-219.
XIAO Y, DING L L, LIAO W J, et al.Corrosion resistances of 304, 316L and 321 Austenite stainless steel in nitrate molten salt[J]. Materials review, 2016(1): 217-219.
[5] GOMESA A, NAVAS M, URANGA N, et al.High-temperature corrosion performance of austenitic stainless steels type AISI 316L and AISI 321H, in molten Solar Salt[J]. Solar energy, 2019, 177: 408-419.
[6] KRUIZENGA A, GILL D.Corrosion of iron stainless steels in molten nitrate salt[J]. Energy procedia, 2014, 49: 878-887.
[7] JAVIER F R C,PRIETO C, MADINA V, et al. Materials selection for thermal energy storage systems in parabolic trough collector solar facilities using high chloride content nitrate salts[J]. Solarenergy materials & solarcells, 2017,163(Complete): 134-147.
[8] FEDERSEL K, WORTMANN J, LADENBERGER M.High-temperature and corrosion behavior of nitrate nitrite molten salt mixtures regarding their application inconcentrating solar power plants[J]. Energy procedia, 2015, 69: 618-25.
[9] 邹露璐. 四元混合熔融盐的配方优选及蓄系统的经济性分析[D]. 呼和浩特: 内蒙古工业大学, 2018.
ZOU L L.Formulation optimization of quaternary mixed molten salt and economic analysis of thermal storage system[D]. Hohhot: Inner Mongolia University of Technology, 2018.
[10] SUN Z, SU L, GAO X Y, et al.Influences of impurity Cl on the thermal performance of solar salt for thermal energy storage[J]. Solar energy, 2021, 216: 90-95.
[11] ZHANG X M, ZHANG C C, WU Y T.Experimental research of high temperature dynamic corrosion characteristic of stainless steels in nitrate eutectic molten salt[J]. Solar energy, 2020, 209: 618-627.
[12] FERNÁNDEZ Á G, CABEZA L F. Molten salt corrosion mechanisms of nitrate based thermal energy storage materials for concentrated solar power plants: a review[J]. Solar energy materials and solar cells, 2019, 194: 160-165.
[13] 李峰. 304L在高温碱性溶液中应力腐蚀开裂的研究[D]. 南京: 南京工业大学, 2006.
LI F.Study on stress corrosion cracking of 304L in high temperature alkaline solution[D]. Nanjing: Nanjing Tech University, 2006.
基金
国家自然科学基金（52076006）; 国家重点研发计划（2017YFB0903603）
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