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首页> 外文期刊>International Journal of Electrochemical Science >Effect of Low Temperature Plasma Nitriding on Salt Spray Corrosion and Electrochemical Corrosion of H13 Hot Work Mould Steel
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Effect of Low Temperature Plasma Nitriding on Salt Spray Corrosion and Electrochemical Corrosion of H13 Hot Work Mould Steel

机译：低温等离子渗氮对H13热作模具钢盐雾腐蚀和电化学腐蚀的影响

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A nitrided layer was fabricated on H13 hot work mould steel using a low temperature plasma nitriding(LTPN). The morphologies, distributions of chemical elements and phases of obtained nitrided layerwere characterized using a scanning electron microscopy (SEM), energy dispersive spectrometer(EDS) and X–ray diffractometry (XRD), respectively, its nanohardness and modulus of elasticity wasmeasured using a nanoindentation, and its bonding strength was tested using a scratch test. Thecorrosion properties of substrate and nitrided layer were analyzed using a salt spray corrosion andelectrochemical corrosion. The results show that the nitrided layer is primarily composed of nitrides,whose nanohardness and modulus of elasticity is 11.0 and 213.0 GPa, respectively, and the averagebonding strength of nitrided layer is 50.23 N measured by scratch test, showing high bonding strengthbetween the nitrided layer and the substrate. The corrosion products on the substrate and nitrided layerafter SSC are γ–FeOOH and α–FeOOH, of which the α–FeOOH prevents further the nitride layer andsubstrate from corrosion. The corrosion potential of substrate and nitrided layer is –0.79 and –0.65 V,respectively, exhibiting that the nitrided layer has higher electrochemical corrosion resistance. Thecapacitive impedance loop of nitrided layer is significantly larger than that of substrate, its lowestmeasurement frequency |Z|0.01Hz and low–frequency phase angle values are also greater than thesubstrate, showing that the nitrided layer is acted as an effective anti–corrosion barrier layer to preventcorrosive ions from entering into the substrate, which increases its electrochemical corrosionresistance.
机译：使用低温等离子体氮化（LTPN）在H13热作模具钢上制造氮化层。用扫描电子显微镜（SEM），能谱仪（EDS）和X射线衍射仪（XRD）分别表征了所得氮化层的形貌，化学元素分布和相，并利用纳米压痕法测量了其纳米硬度和弹性模量。 ，并使用划痕测试测试其粘合强度。利用盐雾腐蚀和电化学腐蚀对基材和氮化层的腐蚀性能进行了分析。结果表明，渗氮层主要由氮化物组成，其纳米硬度和弹性模量分别为11.0和213.0 GPa，经划痕试验测得渗氮层的平均粘结强度为50.23 N，表明渗氮层与渗氮层之间的粘结强度较高。基板。 SSC处理后，基材和氮化层上的腐蚀产物为γ–FeOOH和α–FeOOH，其中α–FeOOH可以进一步防止氮化物层和基材腐蚀。基材和氮化层的腐蚀电位分别为–0.79和–0.65 V，这表明氮化层具有更高的耐电化学腐蚀性能。氮化层的电容性阻抗回路明显大于基板，其最低测量频率| Z | 0.01Hz，低频相角值也大于基板，表明氮化层可作为有效的防腐蚀层以防止腐蚀性离子进入基材，从而增加其电化学耐腐蚀性。

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