采用直流反应磁控溅射技术在304不锈钢表面制备Cr/a-C∶H薄膜进行表面改性,有望提高其在NaCl溶液中的耐蚀性能.采用Raman光谱仪、X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)和原子力显微镜(AFM)研究了Cr/a-C∶H薄膜的微观结构和表面形貌;利用接触角测量仪和动电位极化曲线研究了304不锈钢表面沉积Cr/a-C∶H薄膜前后的润湿性和抗腐蚀性能.结果表明:所制备薄膜为Cr3C2纳米晶镶嵌非晶碳的典型纳米晶/非晶复合薄膜;薄膜表面光滑、结构均匀致密;沉积Cr/a-C∶H薄膜后304不锈钢表面由亲水性转为疏水性,水接触角达到95°;在3.5％NaCl溶液中304不锈钢表面沉积Cr/a-C∶H薄膜体系的自腐蚀电位约为-0.06 V,腐蚀电流密度为2.95×10-8 A/cm2,极化电阻为14.07× 105Ω·cm2,相比于表面无薄膜防护的304不锈钢,该体系的抗腐蚀性能得到明显提升.
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