The control of the internal surface defects of anti-corrosion steel pipes is an important engineering task, because these defects may affect the performance, life and safety of the pipeline. The following are some methods to control the internal surface defects of anti-corrosion steel pipes:

1. Selection of raw materials: High-quality steel pipe raw materials are the basis for manufacturing anti-corrosion steel pipes. Choose steel pipes with stable quality and no defects to ensure that the surface finish, chemical composition and mechanical properties of the raw materials meet the requirements.

2. Pretreatment process: The steel pipe needs to be pretreated before manufacturing, including rust removal, cleaning and drying steps. These pretreatment processes can remove dirt, rust and other impurities on the surface of the steel pipe and provide a clean surface for subsequent anti-corrosion treatment.

3. Anti-corrosion treatment: Select a suitable anti-corrosion paint or coating to ensure that the coating has a good bonding force with the steel pipe substrate, and has excellent corrosion resistance and wear resistance. In the coating process, the thickness, uniformity and continuity of the coating should be controlled to avoid defects such as bubbles and pinholes.

4. Endoscopic inspection: Use an endoscope to inspect the inner surface of the anti-corrosion steel pipe, which can find and repair potential defects in time. Endoscopy can accurately identify surface scratches, pits, bumps, and other abnormalities.

5. Quality monitoring: Establish a strict quality monitoring system to monitor the production process of anti-corrosion steel pipes in real time. Through regular testing and evaluation, to ensure that each process meets the quality requirements, timely detection and correction of problems.

6. Personnel training: training of production personnel to improve their skill level and quality awareness. Employees need to understand the manufacturing process and quality control points of anti-corrosion steel pipes, master the correct operation methods, and avoid internal surface defects caused by human factors.

7. Feedback and improvement: Establish a customer feedback mechanism to collect users' usage and opinions. According to the feedback information, the production process of anti-corrosion steel pipe is continuously improved and optimized to improve product quality.

Regular inspection and maintenance: For anti-corrosion steel pipes that have been put into use, the inner surface should be inspected and maintained regularly. Find and deal with potential defects in time to ensure the safe operation of the pipeline.

To sum up, the control of internal surface defects of anti-corrosion steel pipes needs to start from the aspects of raw material selection, pretreatment process, anti-corrosion treatment, endoscopic inspection, quality monitoring, personnel training, feedback and improvement, and regular inspection and maintenance to ensure product quality and safety.