关键词: 弹性模量, 电刷镀层, 纳米压痕法, 硬度

Abstract: A new type nano test system is introduced, the test principle and the indentation data analysis method are described. It is used to test the micro mechanical properties of brush plated Ni coating on steel, such as hardness, modulus of elasticity and anti-indentation creep property, and the regularities of mechanical properties distribution with coating thickness are researched. The results show that the coating exhibits uniform mechanical properties throughout its thickness, with the exception of a few regions with low hardness and modulus due to some flaws and a few regions with high hardness and modulus on the surface and subsurface. The average hardness and modulus of elasticity of Ni coating are 7.02 Gpa and 183 Gpa respectively, thereinto the hardness is 2.9 times of steel. The Ni coating has greater resistance to indentation creep than steel under the test condition. These results supply useful data for process improvement, new type material development and application expansion.

Key words: Brush plated coating, Hardness, Modulus of elasticity, Nanoindentation