热处理时间对电沉积Fe-4.8Zn合金组织演变及电化学降解行为的影响

王佳文; 王伟强

doi:10.7513/j.issn.1004-7638.2026.04.009

热处理时间对电沉积Fe-4.8Zn合金组织演变及电化学降解行为的影响

doi: 10.7513/j.issn.1004-7638.2026.04.009

王佳文,
王伟强^,

大连理工大学材料科学与工程学院, 辽宁大连116024

基金项目: 中央高校基础研究资金（DUT25YG260； DUT24YG144）。

详细信息

作者简介:
王佳文，1998年出生，男，河南商丘人，硕士研究生，主要研究方向为医用金属材料，E-mail：22305082@mail.dlut.edu.cn

通讯作者:
王伟强，1974年出生，男，辽宁大连人，博士，主要研究方向为医用金属材料，E-mail：wangwq@dlut.edu.cn

中图分类号: TG146,TQ153
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出版历程
- 收稿日期: 2026-03-16
- 录用日期: 2026-04-16
- 修回日期: 2026-04-14
- 刊出日期: 2026-08-31

Effect of heat treatment duration on microstructure evolution and electrochemical degradation behavior of electrodeposited Fe-4.8Zn alloy

WANG Jiawen,
WANG Weiqiang^,

School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

摘要

摘要: 以脉冲电沉积制备的 Fe-4.8Zn 合金为研究对象，在 450 ℃下进行不同保温时间热处理，系统研究了热处理时间对其显微组织、物相组成、元素分布、显微硬度及电化学降解行为的影响。结果表明，热处理促进了合金表面及截面组织的回复、重排与均匀化；XRD 结果显示，各样品均以 α-Fe 固溶体为主，热处理后衍射峰向高角度方向轻微偏移。合金中Fe与Zn分布均匀，未发生明显的元素再分布。随着保温时间延长，合金显微硬度逐渐升高，腐蚀电位逐步正移，腐蚀电流密度和腐蚀速率持续降低，电荷转移电阻逐渐增大。表明热处理时间对 Fe-4.8Zn 合金的组织结构、力学性能及电化学降解行为具有显著影响，可为 Fe-Zn 可降解血管支架材料的热处理调控提供试验依据。
- Fe-Zn合金 /
- 脉冲电沉积 /
- 热处理 /
- 组织演化 /
- 显微硬度 /
- 电化学降解
Abstract: Fe-4.8Zn alloy prepared by pulse electrodeposition was heat-treated at 450 ℃ for different holding times. The effects of heat treatment duration on the microstructure, phase composition, elemental distribution, microhardness, and electrochemical degradation behavior of the alloy were systematically studied. The results showed that heat treatment improved the recovery, rearrangement and homogenization of the microstructure on the surface and cross-section of the alloy. XRD analysis indicated that all samples were mainly composed of the α-Fe solid solution, and the diffraction peaks shifted slightly toward higher angles after heat treatment. The distributions of Fe and Zn were uniform, and no obvious elemental redistribution was observed. With increasing holding time, the microhardness of the alloy gradually increased, the corrosion potential shifted positively, the corrosion current density and corrosion rate decreased continuously, and the charge transfer resistance increased progressively. These results indicate that heat treatment duration has a significant effect on the microstructure, mechanical properties, and electrochemical degradation behavior of Fe-4.8Zn alloy, which provides an experimental support for the heat-treatment optimization of Fe-Zn alloys for biodegradable vascular stent applications.
- Fe-Zn alloy /
- pulse electrodeposition /
- heat treatment /
- microstructure evolution /
- microhardness /
- electrochemical degradation

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图 1 热处理工艺示意

Figure 1. Schematic diagram of heat treatment process

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图 2 不同保温时间下Fe-4.8Zn的表面形貌

Figure 2. Surface morphology of Fe-4.8Zn under various holding times

(a) Untreated； (b) 20 min；(c) 40 min；(d) 60 min；

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图 3 不同保温时间下Fe-4.8Zn的截面形貌

Figure 3. Cross-sectional morphology of Fe-4.8Zn alloy under various holding times

(b) Untreated; (b) 20 min；(c) 40 min；(d) 60 min；

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图 4 不同保温时间下Fe-4.8Zn的XRD图谱

Figure 4. XRD patterns of Fe-4.8Zn under various holding times

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图 5 不同保温时间下Fe-4.8Zn的截面元素分布

Figure 5. Cross-sectional elemental distribution of Fe-4.8Zn under different holding times

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图 6 不同保温时间下Fe-4.8Zn的硬度

Figure 6. Hardness of Fe-4.8Zn under various holding times

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图 7 不同保温时间下Fe-4.8Zn在SBF溶液中的极化曲线

Figure 7. Polarization curves of Fe-4.8Zn in SBF solution under various holding times

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图 8 不同保温时间下Fe-4.8Zn在SBF溶液中的EIS结果

（a）Nyquist图谱；（b）（c）Bode图；（d）等效电路模型

Figure 8. EIS results of Fe-4.8Zn alloy in SBF solution under different holding times

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表 1 电沉积Fe-Zn合金溶液组成

Table 1. Bath compositions of electrodeposition for Fe-Zn alloys

Chemicals	Concentration/(g·L^-1)	Purity/%
FeCl₂·4H₂O	253.00	99.0
ZnCl₂	30.50	98.0
NaCl	45.00	AR
MnCl₂·4H₂O	19.50	99.0
C₆H₈O₆	5.00	AR
C₆H₅Na₃O₇·2H₂O	0.88	99.0
C₆H₄SO₂NNaCO·2H₂O	1.90	AR
CH₃(CH₂)₁₁OSO₃Na	0.10	AR
H₃BO₃	30.00	99.5
C₃H₄O₄	5.00	98.0

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表 2 电沉积Fe-4.8Zn合金的工艺参数

Table 2. Process parameters for the electrodeposition of Fe-4.8Zn alloy

Parameters	ton⁺/ms	toff⁺/ms	ton⁻/ms	toff⁻/ms	Ip⁺/(A·dm^-2)	Ip⁻/(A·dm^-2)	N⁺	N⁻	F/Hz
setpoint	0.2	1.8	0.2	1.8	10	8	20	5	500

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表 3 配制1000 mL SBF所需的试剂及用量

Table 3. Reagents and dosages for preparing 1000 mL SBF

Reagents	Amount/g	Purity/%
NaCl	8.036	AR
NaHCO₃	0.352	AR
KCl	0.225	AR
K₂HPO₄·3H₂O	0.230	AR
MgCl₂·6H₂O	0.311	AR
HCl*	40*
CaCl₂	0.293	AR
Na₂SO₄	0.072	AR
TRIS	6.063	99.8
注：*指浓度为1.0 mol/mL的HCl溶液，用量为40 mL。

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表 4 从动电位极化曲线获得的电化学参数

Table 4. Electrochemical parameters obtained from potentiodynamic polarization curves

Times/min	E_corr /V	I_corr /(μA·cm^-2)	CR/(mm·a^-1)
Untreated	−0.769	17.431	0.205
20	−0.757	14.699	0.173
40	−0.737	13.310	0.157
60	−0.706	11.804	0.139

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表 5 电化学阻抗谱拟合结果

Table 5. Fitting results of EIS

Times/min	R_s/(Ω·cm⁻²)	W_R/(Ω·cm²)	CPE_dl×10⁴/(F·cm²·s^1-n)	n_dl	R_ct/(Ω·cm^-2)
Untreated	24.31	1257	6.99	0.72	922
20	29.14	1246	3.66	0.77	1128
40	30.51	1295	2.04	0.81	1578
60	35.40	1326	2.18	0.77	1749

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