Atmospheric Corrosion Protection of LPBF Manufactured AlSi10Mg by Combining SiO x ‐CVD and PDMS Grafting

<jats:title>ABSTRACT</jats:title> <jats:p> Additive manufacturing by laser powder bed fusion enables complex AlSi10Mg components but produces a heterogeneous microstructure prone to localized corrosion. In this study, hydrophobic polydimethylsiloxane (PDMS) ultrathin films, with and without an SiO <jats:italic>ₓ</jats:italic> interlayer attached by chemical vapor deposition (CVD), were applied for corrosion mitigation. Surface modifications were characterized by X‐ray photoelectron spectroscopy (XPS), polarization modulation–infrared reflection–absorption spectroscopy (PM‐IRRAS) and water contact angle (WCA) measurements. Electrochemical behavior was evaluated by electrochemical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), and chronoamperometry by a droplet‐cell approach. Atmospheric corrosion processes simulating marine corrosion were monitored by optical microscopy. Spectroscopic analyses confirm successful PDMS attachment. Electrochemical measurements reveal reduced corrosion current densities by one magnitude, suppressed pitting activity, and anodic shifts of the pitting potential. The SiO <jats:italic>ₓ</jats:italic> ‐CVD + PDMS bilayer exhibits the highest resistance to atmospheric corrosion. </jats:p>