From figure 7
From figure 7, we can conclude that, these some major factors /characteristics is influencing the durability of SC materials. First one, Metal corrosion (oxygen and moisture) was a serious problem in the performance of SCT. The SC-SHP has mainly used in aircraft, automobiles, pipelines and naval vessels these have broad categories of potential applications of SHP surfaces. There is a need for a deeper understanding of not only how to fabricate such surfaces using simple techniques, but also study how the specific surface properties (morphology, roughness, surface chemistry, surface wetting and stability) are significant 28. Vazirinasab et al. 29 reviewed the corrosion resistance of SHP coatings for metal surfaces such as aluminum, copper, magnesium, and steel can waste natural resources and degrade infrastructure. Improvement in the corrosion resistance of these metals is a remarkable application of SHP surfaces. Mohamed et al. 30 reviewed the corrosion behavior of SHP surfaces and significant attention was given to state of the art on corrosion performance of SHP coatings. Yao et al. 31 showed that the resulting SHP copper surface exhibits enhanced corrosion resistance and durability. SHP coatings can effectively enhance the anti-corrosion ability of the metal surface, which supports the possibility of using SHP film as a substitute for chromate-containing passivation coatings to protect metallic substrates was concluded from his review article by Zhan-Fang et al. 32. Aluminum has been generally used in many applications, it is disposed to pollution or damage under harsh working environmental condition. Zheng et al.33 developed a corrosion-resistant, SC and anti-icing application of a stable SHP coating on aluminum surface was studied. SHP multilayer coatings with layer number tuned swapping in surface wettability and redox catalytic anti-corrosion application, the corrosion resistance of the coating was remained steady even after 240?h of exposure, this enhancement is attributed to superhydrophobicity and anodic shift in corrosion potential 34.
Second, many researchers have been studied with the stability, and durability of SHP coatings on different metallic substrates in water and various organic. The stability of SHP surfaces over a wide pH-range was crucial, since they were used as engineering materials in several industrial applications 30. Isimjan et al. 35 reported that in the effect of water, chloroform and decane on the CAs of TiO2/SiO2 coated steel substrates measured after every 24 h for a period of eight days was tested. It is shown that the CAs remained constant, and the surfaces have steady even after 8 days. Influence of solution–immersion timed on surface morphology and the CA presented in Fig. 8. From the figure, 8a shows the surface has a sporadic flake structure of 5 min and after that surface covered by countless flake structures after 15 min (Fig. 8b). The time increased to 30 min, the surface uniformly and completely covered by flake structures (Fig. 8c). With further rising the time for 40 min, the surface still uniformly covered by flake structures, but the flake sizes increased (Fig. 8d). These SEM images showed that the flake structures were formed gradually as the solution-immersion time prolonging 36.