汽车用碳锰钢化学镀Ni-Mo-P合金镀层性能的研究

Study on Properties of Electroless Ni-Mo-P Alloy Coating on Carbon Manganese Steel for Automobile

在汽车用碳锰钢(16Mn钢)表面制备了化学镀Ni-Mo-P合金镀层,并研究了pH值对化学镀Ni-Mo-P合金镀层性能的影响。结果表明:升高pH值有利于增大化学镀Ni-Mo-P合金镀层的沉积速率及厚度。但当pH值大于10时,镀液容易发生水解。随着pH值的增大,化学镀Ni-Mo-P合金镀层中钿的质量分数逐渐提高,进一步提高了化学镀Ni-Mo-P合金镀层的显微硬度和耐蚀性。化学镀Ni-Mo-P合金镀层呈现出典型的颗粒结构,增大pH值有利于细化晶粒。当pH值为11时化学镀Ni-Mo-P合金镀层具有最高的显微硬度和最佳的耐蚀性。

Electroless Ni-Mo-P alloy coating was prepared on the surface of carbon manganese steel(16Mn steel)for automobile,and the effect of pH value on the properties of electroless Ni-Mo-P alloy coating was studied.The results showed that increasing the pH value was beneficial to accelerate the deposition rate and increase the thickness of electroless Ni-Mo-P alloy coating.The bath was easy to hydrolyze when the pH value was higher than 10.With the increase of pH value,the mass fraction of molybdenum in electroless Ni-Mo-P alloy coating increased gradually resulting in a further improvement of the microhardness and corrosion resistance of electroless Ni-Mo-P alloy coating.Electroless Ni-Mo-P alloy coating exhibited a typical granular structure,and increasing the pH value was beneficial to refine the grains.The electroless Ni-Mo-P alloy coating prepared under the condition of pH=11 possessed the highest microhardness and best corrosion resistance.