AISI 304 (SS(304))- and AISI 316 (SS(316))-type stainless steels were coated with 250 nm thickness Ni thin films and post-annealed at different temperatures (423 K, 623 K, 773 K and 923 K) with a constant flow of oxygen (600 sccm). This procedure was carried out to oxidize the Ni thin film which has excellent chemical stability and highly improved the corrosion resistance of steel in sulfuric acid medium. Corrosion behavior of the samples in 1.0 M H₂SO₄ solution was investigated by means of potentiodynamic technique. Both types of annealed samples (i.e., Ni/SS(304) and Ni/SS(316)) showed highest corrosion resistance at 623 K annealing temperature with corrosion inhibition efficiency factors of PE% = 99.60% and 97.87%, respectively. X-ray diffraction and atomic force microscopy were employed before corrosion measurements and scanning electron microscopy after corrosion test for obtaining the crystallography and physical morphology of the samples. A correlation is achieved between the structural variation of the films with the annealing temperature and the potentiodynamic corrosion results. Consistent results are obtained for two types of stainless steel (SS(304) and SS(316)), while better performance of SS(304) is attributed to the initially lower surface roughness of bare SS(304). It is shown that increased annealing temperature enhances the diffusion effect hence larger grains are formed with wider and deeper grooves between them which provide larger effective surfaces (thinner film areas). These regions react faster with the corroding media and initially may form pitted type corrosion which extends by time to form cracks.

AISI 304（SS（304））-型和AISI 316（SS（316））型不锈钢涂有250 nm厚的Ni薄膜并在不同温度（423 K，623 K，773 K和923 K）下进行后退火），并保持恒定的氧气流量（600 sccm）。进行该步骤以氧化具有优异的化学稳定性并大大改善了钢在硫酸介质中的耐腐蚀性的Ni薄膜。样品在1.0 MH ₂ SO _4中的腐蚀行为用电位动力学技术研究溶液。两种类型的退火样品（即Ni / SS（304）和Ni / SS（316））在623 K退火温度下均显示出最高的耐腐蚀性，其缓蚀效率系数分别为PE％= 99.60％和97.87％。在腐蚀测量之前使用X射线衍射和原子力显微镜，在腐蚀测试之后使用扫描电子显微镜，以获得样品的晶体学和物理形态。膜的结构变化与退火温度之间的相关性与电位动力学腐蚀结果之间具有相关性。对于两种类型的不锈钢（SS（304）和SS（316））获得了一致的结果，而SS（304）的更好性能归因于裸SS（304）最初的较低的表面粗糙度。结果表明，增加的退火温度会增强扩散效果，因此会形成较大的晶粒，并在晶粒之间形成更宽，更深的凹槽，从而提供更大的有效表面（较薄的薄膜面积）。这些区域与腐蚀介质的反应更快，最初可能形成点状腐蚀，随着时间的流逝逐渐扩展，形成裂纹。