换热表面Ni-W-P镀层抗垢特性

Anti-fouling properties of electroless Ni-W-P deposit on heat transfer surface

通过调整Ni-W-P化学镀镀液中钨酸钠浓度,获得了钨元素含量不同的三元Ni-W-P镀层。进一步的实验研究表明,随着三元Ni-W-P镀层中钨元素含量的增加,其热稳定性得到显著改善,同时,镀层晶粒转变的激活能值呈增大趋势。三元Ni-W-P镀层的抗垢性随着镀层中钨元素含量的增加而降低,而与镀层表面自由能以及表面粗糙度没有必然的联系。

In the present work,ternary Ni-W-P deposits with different tungsten content were prepared by varying sodium tungstate concentration in electroless plating.Studies on phase transformation behavior carried out by differential scanning calorimetry(DSC)showed that Ni-W-P deposits exhibited higher thermostability and activation energy with the increase of W composition.Further fouling experiments indicated the surfaces of Ni-W-P deposits with different W content inhibited the adhesion of fouling compared with the mild steel surface.However,there is not necessarily a relationship between the fouling adhesion rate and surface roughness or free energy of the ternary Ni-W-P deposits,but is intimately related to the W content.