Abstract In the present study, a data-driven approach was applied to study the effect of silicon percentage, surface roughness, elapsed time, and water droplet size on contact angle (CA) of hypereutectic cast Al-Si alloys. In addition, corrosion resistance of the alloys was studied as a function of silicon content and the surface roughness. A factorial design was utilized for the design of experiment, and statistical analysis, including General Linear Model (GLM) and Polynomial Regression, were performed for the interpretation of the CA values. Wenzel and Cassie-Baxter contact angles were also calculated and compared with the corresponding measured contact angles to study which regime was followed. The statistical analysis results show that surface roughness, droplet size, and elapsed time are significant factors in the variation of contact angle. In addition, CA was observed to increase with surface roughness, droplet size, and elapsed time. It was observed that the experimental CA values follow a quasi Cassie-Baxter regime in which CA increases by increasing surface roughness. Si % turned out to be a statistically non-significant factor. It is possibly due to a trade-off between the increase in CA as a result of a change in surface chemistry and decrease in CA because of the smoother surface of Si compared to the eutectic phase in a given surface finish.

中文翻译：

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基于表面物理和化学性质的过共晶铸造铝硅合金润湿角和耐腐蚀性数据驱动建模

摘要 在本研究中，采用数据驱动的方法来研究硅百分比、表面粗糙度、经过时间和水滴尺寸对过共晶铸造铝硅合金接触角 (CA) 的影响。此外，研究了合金的耐腐蚀性作为硅含量和表面粗糙度的函数。因子设计用于实验设计，并进行统计分析，包括一般线性模型 (GLM) 和多项式回归，用于解释 CA 值。还计算了 Wenzel 和 Cassie-Baxter 接触角，并将其与相应的测量接触角进行比较，以研究遵循哪种方案。统计分析结果表明，表面粗糙度、液滴尺寸和经过时间是影响接触角变化的重要因素。此外，观察到 CA 会随着表面粗糙度、液滴尺寸和经过的时间而增加。据观察，实验 CA 值遵循准 Cassie-Baxter 制度，其中 CA 随表面粗糙度的增加而增加。Si % 被证明是统计上不显着的因素。这可能是由于表面化学变化导致 CA 增加与 CA 减少之间的权衡，因为与给定表面光洁度的共晶相相比，Si 的表面更光滑。