After-treatment agent for inhibiting growth of tin whiskers and preparation method of after-treatment agent

The invention discloses an after-treatment agent for inhibiting the growth of tin whiskers and a preparation method of the after-treatment agent. The after-treatment agent is characterized by comprising the following components in percentage by mass: 0.1-20wt% of long-chain alkane phosphorous acid with not less than 4 carbon atoms; 0.1-20wt% of long-chain alkane phosphite with not less than 4 carbon atoms; and the balance of an alkane solvent with a high boiling point. According to the after-treatment agent for inhibiting the growth of the tin whiskers and the preparation method of the after-treatment agent, the process is simple, the preparation cost is low, and the growth rate of the whiskers can be effectively inhibited. 本发明公开了一种抑制锡晶须生长的后处理剂其制备方法，其特征在于，包括如下按质量百分数计的各组分：0.1-20wt％长链烷烃基亚磷酸，其碳原子数不少于4；0.1-20wt％长链烷烃基亚磷酸酯，其碳原子数不少于4；余量为高沸点烷烃溶剂。本发明的抑制锡晶须生长的后处理剂及其制备方法，工艺简单，制备成本低，可有效抑制晶须生长速率。