Corrosion resistance of a ceria/polymethyltrimethoxysilane modified Mg-Al-layered double hydroxide on AZ31 magnesium alloy

A new environmentally-friendly route to in situ form a high-corrosion-resistant nesquehonite film on pure magnesium

“…A larger |Z| or capacitive loop generally implies a better corrosion protection performance. 21 From Fig. 11, it is observed that both the capacitive loop diameter and Bode impedance |Z| of the carbonated samples increase signicantly compared to the pure Mg substrate and increase with the carbonation time in gaseous CO 2 .…”

Superhydrophobic Silane/Fluorinated Attapulgite@SiO2 Composite Coatings on Magnesium Alloy for Corrosion Protection

“…For the coated samples, there are two time constant can be seen from the curves: one time constant is in the middle frequency region and the other one is at high frequencies reaches approximately 70°, which proves the presence of an outer layer. [42] As the immersion time lengthened, the phase angle at high frequencies decreased, which indicated the degradation of protective performance of the outer layer. [17] After four days immersion, one new time constant at low frequencies appears which is corresponding to the corrosion process of magnesium alloy, indicating the failure of the coating.…”

“…When immersed in NaCl solution, water and chloride ions react with the metal, and an inductive loop occurred at low frequency, indicating the initiation of pitting corrosion. [42,43] The impedance spectrum semicircle of Sample 3 is several times larger than the bare AZ31, which indicates the good performance of the coating. With the prolongation of immersion time, the impedance spectrum semicircle decreased gradually, which indicates that the anticorrosion property degraded gradually.…”

Development of a thiophene derivative modified LDH coating for Mg alloy corrosion protection

“…The intercalation of corrosion inhibitors (CIs) results in the reduction of average sized crystallites and the formation of more compact LDH film through basal spacing expansion [24,26]. Another strategy is immersion in a solution containing different inhibitors to form a new protective film on the LDH surface, which can both seal the micropores and act as the first physical barrier; the new film can show other functions such as superhydrophobicity [27][28][29][30]. For instance, Yao et al prepared a MgAl-LDH film modified with a mixture of methyltrimethoxysilane and cerium nitrate on AZ31 Mg alloy.…”