AISI 430 stainless steel is used for interconnects in solid oxide fuel cells (SOFCs). One of the main problems with this steel is the formation of chromia scales during oxidation at high temperature and thus increasing electrical resistance. In order to solve such problems, a protective and conductive coating layer can be applied on interconnects. In this study, AISI 430 steel was coated by Ni–P–TiO₂–ZrO₂ composite coating. To evaluate the oxidation behavior, isothermal and cyclic oxidation tests were used at 800 °C. Area specific resistances (ASR) of uncoated and coated samples were also compared as a function of time during oxidation at 800 °C. Chemical composition and surface morphology of the samples were examined before and after oxidation by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). In isothermal and cyclic oxidation tests, coated samples showed lower weight gain due to the formation of Ni₂P₂O₇, Ni₃P₂O₈, and NiFe₂O₄ spinel. This spinel prevented outward Cr diffusion, and improved the oxidation resistance of the AISI 430 stainless steel substrate. The obtained result by cyclic oxidation revealed that the coated substrates were resistant against cracking and spallation. Also, the results showed that the formation of Ni₂P₂O₇, Ni₃P₂O₈, and NiFe₂O₄ spinel and also the presence of TiO₂ and ZrO₂ caused ASR reduction. ASR of Ni–P–TiO₂–ZrO₂-coated specimens after 300 h of oxidation at 800 ºC (14.21 mΩ cm²) was lower than the uncoated specimens (41.84 mΩ m²) after the same time of oxidation.

AISI 430不锈钢用于固体氧化物燃料电池（SOFC）的互连。这种钢的主要问题之一是在高温氧化过程中氧化铬皮的形成，从而增加了电阻。为了解决这些问题，可以在互连上施加保护性导电涂层。在这项研究中，AISI 430钢镀有Ni–P–TiO ₂ –ZrO ₂复合涂料。为了评估氧化行为，在800°C下使用了等温和循环氧化测试。还比较了未涂覆和涂覆样品的面积比电阻（ASR）与800°C氧化过程中时间的关系。在氧化之前和之后，通过扫描电子显微镜（SEM）和X射线衍射（XRD）检查样品的化学组成和表面形态。在等温和循环氧化测试中，由于形成了Ni ₂ P ₂ O ₇，Ni ₃ P ₂ O ₈和NiFe ₂ O ₄，涂层样品显示出较低的重量增加尖晶石。该尖晶石防止了Cr向外扩散，并改善了AISI 430不锈钢基材的抗氧化性。通过循环氧化获得的结果表明，涂​​覆的基材具有抗开裂和抗剥落性。而且，结果表明，Ni ₂ P ₂ O ₇，Ni ₃ P ₂ O ₈和NiFe ₂ O ₄尖晶石的形成以及TiO ₂和ZrO ₂的存在引起ASR降低。在800ºC（14.21mΩcm ^2）氧化300小时后，Ni–P–TiO ₂ –ZrO ₂涂层样品的ASR）在相同的氧化时间之后比未涂覆的样品（41.84mΩm ²）低。