Corrosion of pipelines is a critical factor affecting the reliability and service life of pipeline systems. The selection and use of appropriate anti-corrosion coatings are of great significance for the safe operation, service life, and cost reduction of pipelines. Corrosion refers to the chemical and electrochemical reactions between metal surfaces and environmental media, leading to the degradation and failure of materials, and ultimately causing material failure. Therefore, metal corrosion is a major economic issue. According to relevant data, China's annual losses due to metal corrosion account for about 5% of the national economic output, with pipeline corrosion accounting for a considerable portion. Hence, enhancing the protection against pipeline corrosion has become increasingly important, as it concerns the anti-corrosion performance and operational lifespan of pipelines.

The Role and Performance Requirements of Corrosion-Resistant Coatings

1. The Role of Corrosion Coatings

The principle of corrosion prevention in protective coatings is primarily to prevent corrosive media such as H2O, Cl-, SO2, etc., from渗透 into the metal surface. This isolates the corrosive media from the metal surface, thereby preventing corrosion of the metal. The main functions of pipeline anti-corrosion coatings are as follows:

(1) Shielding function.

(2) Corrosion Inhibition Performance.

(3) Sacrificial Anode Protection Effect

(4) Performance Enhancement Impact

2. Pipeline Corrosion-Resistant Coating Performance Requirements

To enhance the anti-corrosion performance of coatings and maximize their protective effect, in line with the actual conditions of pipeline anti-corrosion, the requirements for the anti-corrosion coating properties are as follows:

(1) Excellent stability against corrosive media.

(2) Excellent moisture resistance ensures low water absorption.

(3) Excellent mechanical strength.

(4) Excellent electrical insulation properties.