Targeted corrosion inhibitor for marine reinforced concrete, and preparation and application thereof

A method for preparing a targeted corrosion inhibitor, the targeted corrosion inhibitor being a nano silver-loaded nitrite-intercalated Ca—Al layered double hydroxide,

• the method comprising:
• (S1) dissolving sodium carbonate, calcium hydroxide, sodium metaaluminate, silver nitrate and sodium nitrite in boiling water, respectively, to obtain a first solution, a second solution, a third solution, a fourth solution and a fifth solution;
• (S2) mixing the first solution, the second solution and the third solution followed by pH adjustment to obtain a reaction solution;
• and stirring the reaction solution;
• (S3) subjecting the reaction solution to a hydrothermal reaction followed by vacuum filtration to obtain a first filter cake;
• and washing, drying and grinding the first filter cake to obtain a Ca-layered double hydroxide (Ca-LDH);
• (S4) calcining the Ca-LDH obtained in step (S3) to obtain a Ca-layered double oxide (Ca-LDO);
• (S5) dissolving the Ca-LDO in the fourth solution followed by pH adjustment, stirring and vacuum filtration to obtain a second filter cake;
• and washing and drying the second filter cake to obtain an Ag/Ca-layered double oxide (Ag/Ca-LDO);
• and
• (S6) dissolving the Ag/Ca-LDO in the fifth solution followed by stirring at room temperature for 24-48 h, and vacuum filtration to obtain a third filter cake;
• and washing and drying the third filter cake to obtain the targeted corrosion inhibitor.