(La0.2Ce0.2Gd0.2Er0.2Sm0.2)2Zr2O7 High-entropy ceramic-glass composite coating with a high corrosion resistance

In this work, a new type of high-entropy ceramic powder (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Sm 0.2 ) 2 Zr 2 O 7 was synthesized by sol-gel method and high-temperature sintering (1000 °C) method. Combing (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Sm 0.2 ) 2 Zr 2 O 7 and glass powder to prepare high-entropy ceramic-glass composite coating. The composite coating exhibits excellent seawater corrosion resistance and high-temperature resistance performance. The impedance values of composite coating are 2.36 × 10 6  Ω cm 2 in 3.5 % NaCl solution for 24 h. The high-entropy ceramic-glass composite coating could withstand the high temperature of 600 °C for 30 days and remains tight and intact with stainless steel without falling out. This work shows that the (La 0.2 Ce 0.2 Gd 0.2 Er 0.2 Sm 0.2 ) 2 Zr 2 O 7 -glass composite coating can provide long-term high-temperature and seawater corrosion protection for stainless steel and has good application prospects in the field of marine corrosion protection.