Immersion corrosion and electrochemical performances of laser cladded FeSiB, FeSiBCr and FeSiBCrMo coatings in 3.5 wt% NaCl solution
Immersion corrosion and electrochemical performances of laser cladded FeSiB, FeSiBCr and FeSiBCrMo coatings in 3.5 wt% NaCl solution
复制标题
DOI：
10.1016/j.surfcoat.2019.125229
复制
发表时间：
2020-02
影响因子：
5.4
通讯作者：
Jiali Zhou;D. Kong
中科院分区：
文献类型：
--
作者：
Jiali Zhou;D. Kong
采用预铺粉末法在S355钢表面激光熔覆FeSiB、FeSiBCr和FeSiBCrMo涂层。采用扫描电镜（SEM）、能谱仪（EDS）和x射线衍射仪（XRD）分析了涂层的表面形貌和截面形貌、化学元素和物相，并分析了Cr和Mo添加量对涂层在3.5 wt% NaCl溶液中浸泡720 h的腐蚀性能和电化学性能的影响。结果表明：FeSiB、FeSiBCr和FeSiBCrMo涂层的非晶态面积分数分别为7.27%、10.51%和10.07%；FeSiB、FeSiBCr和FeSiBCrMo涂层的浸泡腐蚀速率分别为68.4、31.6和27.6 μm/年，极化电阻分别为5464、12645和19016 Ω·cm2。分别加入Cr和Mo，形成了cr2o3钝化膜，并进一步改善了cr2o3钝化膜，抑制了浸蚀和电化学腐蚀的发生。
FeSiB, FeSiBCr and FeSiBCrMo coatings were laser cladded on S355 steel using a pre–placed powder method. The surface and cross–section morphologies, chemical elements and phases of obtained coatings was analyzed using a scanning electron microscope (SEM), energy dispersive spectroscope (EDS), and X–ray diffraction (XRD), respectively, and the effects of Cr and Mo additions on the immersion corrosion and electrochemical performances of obtained coatings in 3.5 wt% NaCl solution for 720 h were analyzed. The result shows that the amorphous area fractions of FeSiB, FeSiBCr and FeSiBCrMo coatings are 7.27, 10.51, and 10.07%, respectively. The immersion corrosion rates of FeSiB, FeSiBCr and FeSiBCrMo coatings are 68.4, 31.6 and 27.6 μm/year, respectively, and the corresponding polarization resistances are 5464, 12,645, and 19,016 Ω·cm2, respectively. The Cr2O3passivation film is formed and further improved by the additions of Cr and Mo, respectively, which inhibits the occurrences of immersion and electrochemical corrosions.