Cement Mortar Coating, cement coating, pipe coating

Cement Mortar Coating

Cement mortar coating (or lining) is a protective layer applied to the surface of steel pipes, concrete pipes, or other piping materials. It is primarily composed of a mixture of cement and sand, sometimes with additives to improve performance. It can be used both inside pipes (called lining) and outside pipes (called coating), and its function is to protect the pipes, extend their service life, and improve fluid transport efficiency.

Product Overview

Cement mortar coated steel pipe is a functional pipe system that uses carbon steel or alloy steel pipe as the base material, and forms a uniform and dense cement mortar anti-corrosion layer on the inner wall through centrifugal or spraying processes. Its core principle is to utilize the alkaline environment (pH 12-13) of the cement mortar to form a passivation film on the pipe wall, isolating the medium from contact with the metal, thereby achieving the purpose of corrosion prevention, rust prevention, and extending the pipe's lifespan. This product is widely used in municipal water supply, petrochemical, and sewage treatment fields, combining economy and reliability.

Specification	Description
Material	High‑quality carbon steel or alloy steel
Coating Type	Cement mortar lining / coating
Application Method	Centrifugal spinning or mechanical spraying
Standards	AWWA C205, custom industrial specifications
Diameter Range	Typical: 100 mm – 3000+ mm (varies by project)
Thickness	Engineered per design, compliant with standard requirements

Production Process of Cement Mortar Coating

1. Centrifugal Method (DN400 and below): Pre-treatment of the inner wall of the steel pipe (sandblasting to Sa2.5 grade).Cement mortar (mixture ratio: water:cement:sand = 0.6:1:3) is applied by high-speed centrifugal spraying to form a uniform coating.

2. Spraying Method (DN700 and above): The mortar is sprayed onto the inner wall using a pipe spraying machine, supplemented with wire mesh to enhance crack resistance (especially for large-diameter pipes).

3. Curing and Post-treatment: Natural air drying for 2-3 days to avoid early cracking.After final setting, water curing for ≥7 days to ensure full cement hydration.

Production Process of Cement Mortar Coating