Q235碳钢表面镍铬合金化层的耐海水好氧菌腐蚀性能  

Corrosion Resistance of Ni-Cr Alloyed Layer on Q235 Carbon Steel to Seawater Aerobic Bacteria

作　　者：孙彩霞 戴景杰[1,2,3] 张红霞 王川 SUN Cai-xia;DAI Jing-jie;ZHANG Hong-xia;WANG Chuan(Key Laboratory of New Metallic Functional Materials and Advanced Surface Engineering in Universities of Shandong,Qingdao Binhai University,Shandong Qingdao 266555,China;School of Mechanical and Electronic Engineering,Qingdao Binhai University,Shandong Qingdao 266555,China;Qingdao Engineering Research Center for New Metallic Functional Materials,Shandong Qingdao 266555,China)

机构地区：[1]青岛滨海学院山东省高等学校新金属功能材料及先进表面工程重点实验室,山东青岛266555 [2]青岛滨海学院机电工程学院,山东青岛266555 [3]青岛市新金属功能材料工程研究中心,山东青岛266555

出　　处：《表面技术》2022年第5期99-110,共12页Surface Technology

基　　金：山东省高等学校青创科技计划项目(2019KJA022);青岛西海岸新区源头创新项目(2020-104,2020-105)。

摘　　要：目的揭示弧辉等离子体镍铬共渗处理对Q235碳钢表面成分、结构和耐海水好氧菌腐蚀性能的影响。方法采用弧辉等离子体渗镀技术在Q235碳钢表面制备镍铬合金化层。利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对镍铬合金化层的相组成、表面形貌和截面元素分布进行分析。利用电化学测试技术,测试并分析镍铬合金化层在海水好氧菌中的腐蚀电化学行为。结果Q235碳钢经弧辉等离子体镍铬共渗后,表面形成了一层厚度约为50μm的镍铬合金化层,合金化层的物相为Ni_(2.9)Cr_(0.7)Fe_(0.36)固溶体。在好氧菌中浸泡时,Q235碳钢表面形成了生物腐蚀膜,腐蚀膜的存在使Q235碳钢的腐蚀电位负移,局部耐蚀性降低。与Q235碳钢相比,镍铬合金化层的表面能降低,表面接触角达到111°。镍铬合金化层在好氧菌中浸泡11 d后,仅在很少的局部位置观察到细菌附着,未观察到明显的腐蚀膜。结论Q235碳钢在好氧菌中浸泡时腐蚀严重,浸泡5 d后就在其表面形成了一层由腐蚀产物、培养基和细菌形成的腐蚀产物膜,腐蚀产物对生物膜的形成有一定的促进作用。镍铬合金化层降低了Q235碳钢表面的表面能,阻碍生物膜底膜的形成,同时形成的钝化层对介质有一定的阻隔,显著提升了耐好氧菌腐蚀的性能。In order to reveal the effect of arc glow plasma NiCr co-infiltration treatment on the surface composition,structure and seawater aerobic corrosion resistance of Q235 carbon steel.Ni-Cr alloying layer was prepared on Q235 carbon steel by arc glow plasma plating.The phase composition,surface morphology and cross-sectional element distribution of Ni-Cr alloying layer were analyzed by X-ray diffraction(XRD)and scanning electron microscope(SEM).The corrosion electrochemical behavior of Ni-Cr alloy layer in seawater aerobic bacteria was tested and analyzed by electrochemical test technology.After arc glow plasma Ni-Cr carburizing,a layer with a thickness of about 50μm was formed on the surface of Q235 carbon steel,and the phase of the alloying layer was Ni_(2.9)Cr_(0.7)Fe_(0.36) solid solution.When Q235 carbon steel was immersed in aerobic bacteria,a biological corrosion film was formed on the surface.The existence of the corrosion film makes the corrosion potential of Q235 carbon steel move negatively and the local corrosion resistance was reduced.Compared with Q235 carbon steel,the surface energy of Ni-Cr alloying layer was reduced and the surface contact angle reaches 111°.After the Ni-Cr alloy layer was soaked in aerobic bacteria for 11 days,bacterial adhesion was observed only in a few local positions,and no obvious corrosion film was observed.Q235 carbon steel was seriously corroded when immersed in aerobic bacteria.After soaking for 5 days,a corrosion product film formed by corrosion products,culture medium and bacteria was formed on its surface.The corrosion products can promote the formation of biofilm.The Ni-Cr alloying layer reduces the surface energy of Q235 carbon steel surface and hinders the formation of biofilm bottom film.At the same time,the formed passivation layer had a certain barrier to the medium and significantly improves the corrosion resistance of aerobic bacteria.

关 键 词：Q235碳钢 弧辉等离子体渗镀 镍铬合金化层 好氧菌 电化学性能 

分 类 号：TG174[金属学及工艺—金属表面处理]