海洋平台结构件表面脉冲纳米复合镀层的制备

Preparation of Nano Composite Coatings for Offshore Platform Structure Surface

为了获得致密、平整、晶粒细化的复合镀层,采用双脉冲电源,在Q235海洋平台结构件表面沉积Ni-Al2O3纳米复合镀层,研究了不同条件下制备的复合镀层的微观形貌和组织结构。试验结果显示,镀层晶粒随着镀液中纳米Al2O3颗粒浓度的增加而细化,尺寸均匀,当浓度超过10%时,镀层表面致密,没有明显的晶界;复合镀层随占空比的增加,表面晶界不明显,晶粒细化;采用脉冲电源获得的镀层表面致密、平整,晶粒尺寸细化且较均匀。

In order to obtain the composite coating of dense, smooth and grain refinement, the experiment adopts double pulse power supply, and the nano composite coating which are prepared on the surface of Q235 offshore platform structure. By changing the condition, composite coating is studied in microstructure and organizational structure. The result shows that the coating grain is increased with the increase of nano A1203 particles concentration in plating solution refinement and uniform size. When the concentration is over 10%, coating surface is density with no clear boundary. With the increase of the duty ratio, the grain boundary surface of the composite coating is not obvious and with grain refinement. The coating surface gained by pulse power supply is dense and smooth with grain size refining and uniform.