Effect of In on high-temperature corrosion properties of Sn-Bi-Zn heat transfer and heat storage alloy

doi:10.19799/j.cnki.2095-4239.2021.0355

Abstract

Abstract:

The compatibility of alloy material and container shell is one of the critical factors affecting the service life of the heat transfer and storage system. This paper modifies a previously developed Sn-Bi-Zn heat transfer and storage alloy by adding In element to study the corrosion effect of liquid alloy on 20 carbon steel, 304 stainless steel, and 316 stainless steel at 700 ℃. The experiment adopts the constant temperature full immersion corrosion method. It analyzes the micromorphology and element distribution of alloy matrix and container material before and after corrosion by scanning electron microscope and energy dispersive spectrometer. Differential scanning calorimetry and flash thermal conductivity were used to study the thermal properties of the samples before and after corrosion. The corrosion kinetics shows that the experimental results conform to the parabolic law, and the diffusion coefficient is in the order of D(20C)>D(304)>D(316). The thermal conductivity of the alloy matrix increases slightly during the corrosion process due to the elements' dissolution in the steel sheet and the diffusion and consumption of the matrix alloy elements. Mechanism analysis shows that the Gibbs free energy of the oxidation reaction of In element is smaller than that of the container material. Therefore, an oxide layer can be formed at the corrosion interface to prevent dissolution and oxidation corrosion of the container material.

Key words: Sn-Bi-Zn-In, heat transfer and storage, thermophysical properties, high temperature compatibility

CLC Number:

TK 02

Qingmeng WANG, Zhi LIU, Xiaomin CHENG, Qianju CHENG, Zean LYU. Effect of In on high-temperature corrosion properties of Sn-Bi-Zn heat transfer and heat storage alloy[J]. Energy Storage Science and Technology, 2022, 11(1): 9-18.

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容器材料	C	Si	Mn	P	S	Ni	Cr	Mo	Cu	Fe
20碳钢	0.17～0.23	0.17～0.37	0.35～0.654	≤0.035	≤0.035	≤0.3	≤0.25	—	≤0.25	剩余
304不锈钢	≤0.08	≤1.00	≤2.00	≤0.045	≤0.030	8.0～10.5	18.0～20.0	—	—	剩余
316不锈钢	≤0.08	≤1.00	≤2.00	≤0.045	≤0.030	10.0～14.0	16.0～18.0	2.00～3.00	—	剩余

合金成分	相变温度/℃			相变焓 ?H_m/(J/g)
合金成分	开始	峰值	结束	相变焓 ?H_m/(J/g)
Sn-50Bi-2Zn	133.49	136.15	141.4	47.62
(Sn-50Bi-2Zn)-7In	101.92	127.76	157.70	58.07
腐蚀后Sn-50Bi-2Zn	135.28	136.75	142.31	52.63
腐蚀后(Sn-50Bi-2Zn)-7In	113.08	129.00	157.78	61.49

合金样品	数值	温度/℃
合金样品	数值	60	80	100	150	170	190
腐蚀前 Sn-50Bi-2Zn	比热容 /[J/(g·K)]	0.19	0.21	0.18	0.21	0.22	0.23
腐蚀前 Sn-50Bi-2Zn	平均值 /[J/(g·K)]	0.19			0.22
腐蚀前 (Sn-50Bi-2Zn)-7In	比热容 /[J/(g·K)]	0.31	0.32	0.33	0.36	0.34	0.35
腐蚀前 (Sn-50Bi-2Zn)-7In	平均值 /[J/(g·K)]	0.32			0.35
腐蚀后 Sn-50Bi-2Zn	比热容 /[J/(g·K)]	0.23	0.24	0.25	0.25	0.26	0.27
腐蚀后 Sn-50Bi-2Zn	平均值 /[J/(g·K)]	0.24			0.26
腐蚀后 (Sn-50Bi-2Zn)-7In	比热容 /[J/(g·K)]	0.34	0.36	0.35	0.36	0.38	0.37
腐蚀后 (Sn-50Bi-2Zn)-7In	平均值 /[J/(g·K)]	0.35			0.37

合金样品	XRF元素含量/%
合金样品	Sn	Bi	Zn	In	Cr	Fe	Ni
Sn-50Bi-2Zn	48.29	49.57	2.14	—	—	—	—
(Sn-50Bi-2Zn)-7In	44.73	46.54	1.81	6.92	—	—	—
腐蚀后Sn-50Bi-2Zn	47.28	48.46	2.31	—	0.58	0.39	0.22
腐蚀后(Sn-50Bi-2Zn)-7In	47.01	40.09	2.85	8.02	0.28	—	0.85

区域/元素	C	O	Cr	Fe	Sn	Bi	Ni	Zn	In
A	6.23	—	0.71	87.16	—	0.38	4.43	—	—
B	4.73	3.68	0.23	41.92	29.33	23.56	0.57	0.31	—
C	7.13	1.27	1.05	1.49	0.20	84.83	0.12	0.39	—
D	10.53	—	0.67	88.43	0.37	—	—	—	—
E	10.77	3.75	2.85	50.31	1.03	3.12	2.47	—	25.70
F	10.20	4.56	3.28	23.11	35.05	16.89	—	—	6.97