Different anti-corrosion materials have different effects when used in the same environment

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Different anti-corrosion materials have different effects when used in the same environment. The picture below shows a set of water coolers in a petrochemical company. There is circulating water in the pipe, the temperature is 30 degrees at the inlet and 70 degrees at the outlet. The shell is gasoline, the temperature is 120 degrees at the inlet and 80 degrees at the outlet. Well, in order to verify the effectiveness of two anti-corrosion coatings on gasoline coolers, two materials were used, one was an earthy yellow urushiol coating, and the other was a metal nanopolymer material. Used in the same environment for more than 1 year. The specific effect is shown in the picture. The urushiol paint has failed, and the other one has a good effect without any change. Through use in this condition for more than 10 years. Regarding material costs, urushiol materials are more expensive than metallic nanomaterials. What I want to say through this incident is that it is important to listen to or adopt other people's opinions or experiences in anything you do. However, you must take it seriously when using it in your own environment, and conduct experiments to verify it if necessary. Only the materials chosen in this way can be used by me.