**2.10 Others**

Other examples include furan, polycaprolactone, glycerol, gums, proteins, pectin, drugs and others, which are also used in corrosion resistance (Hussain et al., 2002; Fabbri et al., 2006; Velayuthama et al., 2009; Umoren, 2008; Umoren et al., 2009; Zuo et al., 2005; Sugama, 1995; Abdallah, 2004; Obot et al., 2009). The role of antibacterial and antifungal drugs like Clotrimazole, Fluconazole, Cefixime, Ampicillin, Ampiclox, Cloxacillin, Tetracycline, Methocarbamol, Orphenadrine, Penicillin G, Azithromycin, and others, in corrosion resistance is basically as corrosion inhibitors. The inhibition mechanism is based mainly on adsorption, significantly influenced by the presence of functional groups –CHO, –N=N, R–OH, steric factors, aromaticity, electron density, molecular weight of inhibitor and others (Abdullah, 2004; Obot, et al., 2009; Naqvi et al., 2011; Eddy et al., 2010). Drugs may often compete with "green" corrosion inhibitors. Similarly, gums (Raphia hookeri gum, gum Arabic) also exert their anticorrosion effect as corrosion inhibitors through the formation of films on metal surface via adsorption and thus, blocking off the corrodents present in the environment (Umoren, 2008).

In an excellent review by Shchukin and Mçhwald(Shchukin & Mçhwald, 2007), they have discussed about the nanoreservoirs containing active materials (corrosion inhibitors) for self-repairing coatings and surfaces. Such an approach can be employed on renewable resources in corrosion. In another review by Nimbalkar and Athawale, they have elaborated the use of VO in WB coatings (Athawale & Nimbalkar, 2011). In another excellent report, use of plant extracts as natural corrosion inhibitors has been briefly described (Raja & Sethuraman, 2008). The target of corrosion engineers and chemists, beyond the boundaries, is to achieve and come to a cost effective, environment friendly, user-friendly and long term solution to corrosion-the metallic cancer. For the present, persistent ongoing research efforts in the direction have shown proven results. The substitution of renewable resources based binders and corrosion inhibitors to conventionally used chemicals will pave way for a fruitful utilisation of our naturally available bioresources. With innovative technologies in hand, green chemistry, nanotechnology and green anticorrosion methods and materials as our tools, we can be fully equipped to combat corrosion and related problems, in near future.
