二次氮气压力为2 MPa所制备的铝合金涂层内部致密度高，无明显孔洞与夹层现象，经计算孔隙率为0.9%。涂层与基体界面呈锯齿状，部分粉末颗粒嵌入基体，形成了有效的机械咬合。在沉积超过1 mm的涂层时，涂层的完整性与均匀性都表现较好。二次氮气压力为3 MPa所制备的铝合金涂层内部并无明显孔洞，但涂层与基体结合界面位置孔洞较多，这不利于涂层的紧密结合。二次氮气压力为4 MPa所制备的铝合金涂层虽整体的宏观结构未发生改变，但涂层内部开始出现微米级孔洞。

The aluminum alloy coating prepared by the secondary nitrogen pressure of 2 MPa has high internal density without obvious pores and intercalation, and the calculated porosity is 0.9%. The interface between the coating and the substrate was serrated, and some of the powder particles were embedded in the substrate, forming an effective mechanical occlusion. The integrity and uniformity of the coating performed well when depositing coatings over 1 mm. The aluminum alloy coating prepared by secondary nitrogen pressure of 3 MPa did not have obvious holes inside, but there were more holes at the interface between the coating and the substrate, which was not conducive to the tight bonding of the coating. The aluminum alloy coating prepared by secondary nitrogen pressure of 4 MPa did not change the overall macrostructure, but micron-level pores started to appear inside the coating.