环氧树脂/重结晶碳化硅复合材料的抗腐蚀性能

doi:10.11902/1005.4537.2019.109

中国腐蚀与防护学报

2020, Vol. 40

Issue (4): 373-380 DOI: 10.11902/1005.4537.2019.109

研究报告

本期目录 | 过刊浏览

环氧树脂/重结晶碳化硅复合材料的抗腐蚀性能

付海波, 刘晓茹, 孙媛, 曹大力(

)

沈阳化工大学材料科学与工程学院沈阳 110142

Corrosion Resistance of Epoxy Resin/recrystallized Silicon Carbide Composite

FU Haibo, LIU Xiaoru, SUN Yuan, CAO Dali(

)

College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

全文: PDF(3447 KB) HTML

摘要:

以E44型环氧树脂 (EP) 为填充材料，制备了环氧树脂填充重结晶碳化硅 (EP/RSiC) 复合材料。通过对表面形貌、动态电位极化曲线、电化学阻抗图谱、腐蚀速率进行分析，研究了EP/RSiC在静态室温条件下2 mol/L H₂SO₄溶液和4 mol/L NaOH溶液中的腐蚀行为。结果表明:EP/RSiC复合材料结构致密，具有较低的腐蚀电流密度和较高的自腐蚀电位，抗腐蚀性良好。EP/RSiC复合材料的腐蚀由SiC的活性溶解造成，因此EP/RSiC复合材料更容易受到碱性溶液的腐蚀，并且其腐蚀行为受电荷传递控制；EP/RSiC复合材料的腐蚀速率随EP填充量的增加而减少。15% (体积分数) EP/RSiC的抗腐蚀性最佳，在2 mol/L H₂SO₄溶液中的腐蚀速率为152 mg/(dm²·d)，在4 mol/L NaOH溶液中的腐蚀速率为310 mg/(dm²·d)，与RSiC相比其腐蚀保护效率分别达到90.5%和93.7%。

关键词 ：重结晶碳化硅, 环氧树脂, 复合材料, 腐蚀, 电化学

Abstract：

Resin-filled recrystallized silicon carbide (EP/RSiC) composites with good corrosion resistance were prepared by using E44 epoxy resin as the filling material. The corrosion behavior of EP/RSiC composites in 2 mol/L H₂SO₄ solution and 4 mol/L NaOH solution at room temperature was studied by means of weight loss measurement, potentiodynamic polarization curves measurement, electrochemical impedance spectroscopy as well as corrosion morphology characterization. The results demonstrated that the EP/RSiC composites had a dense structure, low corrosion current density and high free-corrosion potential, and good corrosion resistance. Electrochemical tests suggested that the corrosion of EP/RSiC composites was caused by the active dissolution of silicon carbide. Therefore, EP/RSiC composites were more susceptible to corrosion by alkaline solutions, and their corrosion behavior was controlled by charge transfer. The corrosion rate decreased as the amount of epoxy resin filler increased, among others, the EP/RSiC with 15% (volume fraction) epoxy resin had the best corrosion resistance, namely its corrosion rate was 152 mg/(dm²·d) in 2 mol/L H₂SO₄ solution, while 310 mg/(dm²·d) in 4 mol/L NaOH solution respectively. Which demonstrates that the EP/RSiC with 15% epoxy resin exhibits a corrosion protection efficiency about 90.5% regarding to the plain RSiC without the addition of epoxy resin.

Key words： recrystallized silicon carbide epoxy resin composite corrosion electrochemistry

收稿日期: 2019-07-18

ZTFLH:

TB37

基金资助:共伴生有色金属资源加压湿法冶金技术国家重点实验室基金(yy2016007)

通讯作者: 曹大力 E-mail: caodali2008@126.com

Corresponding author: CAO Dali E-mail: caodali2008@126.com

作者简介: 付海波，男，1996年生，硕士生

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引用本文:

付海波, 刘晓茹, 孙媛, 曹大力. 环氧树脂/重结晶碳化硅复合材料的抗腐蚀性能[J]. 中国腐蚀与防护学报, 2020, 40(4): 373-380.
Haibo FU, Xiaoru LIU, Yuan SUN, Dali CAO. Corrosion Resistance of Epoxy Resin/recrystallized Silicon Carbide Composite. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 373-380.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.109 或 https://www.jcscp.org/CN/Y2020/V40/I4/373

图1 E44-环氧树脂和EP/RSiC复合材料的红外光谱图

图2 RSiC、E44-环氧树脂和EP/RSiC复合材料的XRD谱

图3 腐蚀前后的RSiC和EP/RSiC的SEM像

图4 RSiC和EP/RSiC在2 mol/L H2SO4溶液和4 mol/L NaOH溶液中的极化曲线

表1 由极化曲线得到的电化学参数

图5 RSiC和EP/RSiC在2 mol/L H2SO4溶液中的Nyquist和Bode图

图6 RSiC和 EP/RSiC在4 mol/L NaOH溶液中的Nyquist和Bode图

图7 RSiC和EP/RSiC分别在2 mol/L H2SO4和4 mol/L NaOH溶液中EIS拟合的等效电路

表2 由EIS拟合得到的电化学参数

图8 RSiC和EP/RSiC分别在2 mol/L H2SO4溶液和4 mol/L NaOH溶液中的腐蚀速率

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