Phosfoetanolamina is a new type of additive, which belongs to phosphate compounds and can be widely used in chemical fiber, textile, leather, plastic, paper, cosmetics and other industrial fields.
Ethanolamine phosphate has amino groups and phosphate groups, easily forming covalent bonds with metal atoms and feedback construction, forming a dense protective film on the metal surface, so that metal corrosion is inhibited. Research using ethanolamine phosphate for glycol-based aqueous solution systems Corrosion inhibitors have important theoretical and practical application value to discuss their corrosion inhibition performance and mechanism.
Based on the self-synthesis of ethanolamine phosphate, we used a combination of weightlessness experiment and electrochemical method to study the corrosion inhibition performance and mechanism of ethanolamine phosphate on carbon steel in glycol-based aqueous solution system.
The results show that with the increase of ethanolamine phosphate concentration, the corrosion rate gradually decreases. The corrosion inhibition efficiency measured by the weightlessness method conforms to the Langmuir adsorption isotherm. As the immersion time increases, the corrosion potential continues to shift positively, and the corrosion current density continues to decrease. The corrosion process is mainly controlled by the anode process. Its electrochemical impedance spectrum consists of two capacitive reactance arcs with two time constants, respectively. It is the process of corrosion inhibitor formation and destruction at the interface of carbon steel. Quantum chemical calculations can be seen that the highest orbital occupancy energy and the lowest orbital occupancy energy of ethanolamine phosphate are mainly delocalized near the amino group and phosphate group, which shows that when ethanolamine phosphate is adsorbed on the surface of carbon steel, it mainly depends on -NH3 and -P =0 forms a covalent bond with the metal atom and feedback builds up to form a dense corrosion inhibitor protective film on the metal surface, thus playing a role in blocking the corrosion medium. Minimize the energy of the system and maintain it in the most stable state, effectively blocking the corrosive medium.