External corrosion of metal structures is very common. Flame incidents are also common in the industry. Different types of organic coatings are used to delay the corrosion process as well as to act as a flame-retardant material around the world. It is challenging to use one coating for both purposes. To fulfill this demand a series of water borne polyurethane (PU) coating materials were synthesized in this study. Melamine (M) and modified melamine (MM) were used to synthesize the PU dispersion. The coating nature was changed from hydrophilic to hydrophobic by using M and MM. The coating adhesive strength was also increased with the addition of M and MM. A significant level of improvement was also recorded in corrosion protection and flame-retardant properties. The coating protective performance was higher for MM compared to those for M with fixed compositions.
Metal and its structures corrosion is a natural process. The process started and accelerated in the presence of electrolytes [1, 2]. Thus, it's highly encouraged to stop this electrolyte passage. One of the ways to resist the passage of electrolytes is by making a barrier. The most popular method of such a barrier is an organic coating which mainly comes from polymer resin along with pigments, and additives. Different organic coatings are being used to make a barrier that can ultimately protect the metals and their structures. Epoxy, polyurethane (PU), and acrylate coatings are widely being used for this purpose [3-7].
Flame incidents are also common everywhere. Unfortunately, it's not taken very seriously as it is a sudden action. But this incident can damage not only the property but also human life. The common trend is taking action after the flame incident. Recently, people are encouraged to take action before the incident. Thus, different techniques are being considered to save the structures from the flame incident. Appling a flame-retardant coating is one of the useful methods to limit the damage. Different organic coatings showed a promising flame-retardant property. Especially epoxy, acrylate, and PU coatings have been considered by many research groups for this purpose [2].
