Organosilane, with functional organic groups attached to inorganic silicon atoms, exhibits excellent passivation performance for pyrite. However, a considerable number of micro-cracks will gradually appear on the surface of passivation film under long-term corrosion of oxidizing medium, resulting in a significant decrease of passivation effect. To improve the stability and long-term performance of organosilane coating, a novel passivator (PT-ATP@HQ) with self-healing function was prepared to inhibit the oxidation of pyrite. We chose 3-mercaptopropyltrimethoxysilane (Prop-SH) and tetraethoxysilane (TEOS) as the host coating (PT), and attapulgite clay (ATP) loaded with 8-hydroxyquinoline (8-HQ) was used to endow the coating with better passivation and self-healing performance. The electrochemical and chemical leaching results showed that the addition of ATP@HQ greatly improved the passivation performance of PT coating. The passivation efficiencies of total Fe and SO₄²⁻ reached to 88.1% and 79.2%, respectively. We also found that the protective capability of the scratched PT-ATP@HQ coating can be recovered automatically through 8-HQ release from ATP. The passivation and self-healing mechanisms were investigated by FT-IR, XPS, ²⁹Si NMR, and other characterization methods, which were as follows: firstly, the organosilanes hydrolyzed to form highly active silanol groups, then dehydration condensation reaction occurred between silanol molecules and ATP@HQ to obtain cross-linked network structure connected by Si–O–Si bonds. After that, Si–OH groups reacted with the hydroxyl groups of pyrite to form Fe–O–Si bonds, thereby an inert and dense passivation film attached to the surface of pyrite. Once the passivation film is locally damaged, 8-HQ will automatically release to repair the cracks.

有机硅烷具有与无机硅原子相连的有机官能团，对黄铁矿具有优异的钝化性能。但在氧化性介质的长期腐蚀作用下，钝化膜表面会逐渐出现相当数量的微裂纹，导致钝化效果显着下降。为了提高有机硅烷涂层的稳定性和长期性能，制备了一种具有自修复功能的新型钝化剂（PT-ATP@HQ）来抑制黄铁矿的氧化。我们选择 3-巯基丙基三甲氧基硅烷 (Prop-SH) 和四乙氧基硅烷 (TEOS) 作为主体涂层 (PT)，并使用负载 8-羟基喹啉 (8-HQ) 的凹凸棒粘土 (ATP) 赋予涂层更好的钝化和自-愈合性能。电化学和化学浸出结果表明，ATP@HQ的加入大大提高了PT涂层的钝化性能。总 Fe 和 SO 的钝化效率₄ ^{2- 分别}达到88.1%和79.2%。我们还发现划伤的 PT-ATP@HQ 涂层的保护能力可以通过 ATP 的 8-HQ 释放自动恢复。通过FT-IR、XPS、²⁹ Si NMR等表征方法研究了钝化和自愈机制，具体如下：首先，有机硅烷水解形成高活性硅烷醇基团，然后硅烷醇分子之间发生脱水缩合反应。和 ATP@HQ 以获得由 Si- O- Si 键连接的交联网络结构。之后，Si-OH 基团与黄铁矿的羟基反应形成 Fe- O-Si 键，从而在黄铁矿表面附着一层惰性致密的钝化膜。一旦钝化膜局部损坏，8-HQ会自动释放修复裂纹。