This study explores the corrosion interactions between a metallic canister material, stainless steel (SS) 316, and an I-bearing ceramic waste form, lead vanado-iodoapatite (I-APT, Pb_9.85(VO₄)₆I_1.7), in a chloride solution. Crevice corrosion of the SS in close proximity to the I-APT resulted in the development of an aggressive environment at the interface of the two materials, which was acidic and enriched in Cl⁻ anions. I-APT also corroded in the crevice region, primarily through ion-exchange between the I⁻ ions from the I-APT matrix and anions from the environment. The enrichment of Cl⁻ anions within the occluded crevice space as the result of SS crevice corrosion enhanced the corrosion of I-APT. The release of iodine from this apatite waste form could be accelerated owing to this mechanism. This is evidenced by a depletion of iodine from the I-APT matrix and a large amount of Cl-bearing precipitates on the surfaces of both SS and I-APT. On the other hand, the corrosion of I-APT leads to the precipitation of a V- and Pb-rich layer, which inhibits the localized corrosion of SS to an extent. This study advances the understanding of the near-field corrosion interactions between metallic canisters and ceramic waste forms.

这项研究探讨了金属罐材料不锈钢（SS）316和含I的陶瓷废料形式的钒钒碘磷铅矿（I-APT，Pb _9.85（VO ₄）₆ I _1.7）之间的腐蚀相互作用。氯化物溶液。在靠近I-APT导致的侵蚀性环境中的两种材料，这是酸性和富含氯的界面发展的SS的缝隙腐蚀^-阴离子。I-APT也腐蚀在缝隙区域，主要通过I之间的离子交换^-从环境中的I-APT矩阵和阴离子的离子。氯的富集^-SS缝隙腐蚀导致封闭的缝隙空间内的阴离子增强了I-APT的腐蚀。由于这种机理，可以加速从这种磷灰石废物形式中释放碘。这可以通过I-APT基质中碘的消耗和SS和I-APT的表面上大量含Cl的沉淀来证明。另一方面，I-APT的腐蚀会导致富V和Pb层的沉淀，这在一定程度上抑制了SS的局部腐蚀。这项研究提高了对金属罐与陶瓷废料形式之间近场腐蚀相互作用的理解。