<p>The dissolution behaviors of corrosion products on 316LN stainless steel (SS) in simulated shutdown acid-reducing water chemistry were investigated. The outer Fe- and Ni-rich corrosion products formed in borated and lithiated high-temperature water at 300&#xa0;°C dissolved under the simulated shutdown acid-reducing water chemistry. NiFe₂O₄ began to dissolve at the initial stage of boration, but the dissolution of Fe₃O₄ mainly occurred at the low-temperature stage in shutdown acid-reducing phase. Low pH value and low-temperature conditions are conducive to the dissolution of the outer Fe-rich oxides. The potential–pH (E–pH) diagrams and solubility curves of spinel oxides at different temperatures were calculated. The possible dissolution mechanism of corrosion products was discussed.</p>