Film inhibitor and uses thereof

Abstract

The invention discloses a filming corrosion inhibitor, which at least comprises 30 to 50 percent of octadecylamine, 20 to 30 percent of imidazoline amide, and reducing agent carbohydrazide being the rest, the above proportion is mass percentage. Under the condition that the temperature is 150 to 500 DEG C, the concentration of the filming corrosion inhibitor is 10 to 35 ppm, the pH valve is 7 to 11, and the time duration is 1 h to 10 min, the filming corrosion inhibitor can produce a compact protective film on the metal surface, and the function of preventing the metal to be corroded in the atmospheric environment is realized, especially the invention can be applied during the thermal power plant to stop the boilers for protection, the protective film with strong hydrophobicity and good erosion resistance can be produced on the metal surface inside the water vapor system of the thermal equipment, and the thermal equipment can be protect from being corroded for more than 8 months during the exposition in atmospheric environment, simultaneously, the invention has certain cleaning, uncovering, and removing function to the incrustation and the corrosion product on the metal surface ofthe thermal system, the probability of the thermal equipment corrosion and the four-tube blasting is reduced, the invention is advantageous for extending the acid pickling cycle of the boiler, the service life of the equipment is prolonged, the security is enhanced, and the economic benefit is increased.

Description

technical field [0001] The invention relates to a film-forming corrosion inhibitor and its application, in particular to a film-forming corrosion inhibitor and its application in preventing the shutdown and corrosion of thermal power plants, and belongs to the technical field of film-forming corrosion inhibitors. Background technique [0002] Regardless of the parameters and capacity of the thermal power generating set, it is inevitable to shut down for maintenance or be in a standby state. If effective protection measures are not taken, the water vapor system of the shutdown unit will be exposed to the atmospheric environment, and a large amount of rust will occur. Boiler shutdown corrosion will not only bring huge direct and indirect economic losses, but also greatly endanger the safe operation of thermal units, which is extremely harmful. The octadecylamine shutdown protection method is based on the fact that octadecylamine can form a monolayer or multilayer hydrophobic ...

AI Technical Summary

Problems solved by technology

However, when the film-forming corrosion inhibitor mainly based on imidazoline derivatives is used at high temperature, the pH value of the solution will drop. The pH value of the water is adjusted to between 9.8 and 10.2, which is difficult and risky