Acid-resistant tiles

# Acid-Resistant Tiles: The “Unseen Guardians” of Industrial Corrosion Protection

In industries such as chemical processing, metallurgy, and power generation, corrosive media are ubiquitous—ranging from sulfuric acid storage tanks to flue ducts in desulfurization towers, from pharmaceutical fermentation vessels to wastewater treatment ponds. The corrosion resistance of equipment and flooring directly impacts production safety and operational efficiency. Acid-resistant tiles, a specialized ceramic material with silica as the core component, have become an indispensable “invisible guardian” in industrial anti-corrosion projects thanks to their outstanding acid–alkali resistance, high mechanical strength, and low water absorption.

### I. Material Properties: A Comprehensive Breakthrough from Molecular Structure to Physical Performance

The core raw materials of acid-resistant tiles are quartz, feldspar, and clay. After high-temperature firing at 1,380°C, the silica content exceeds 70%, resulting in a dense crystalline structure. Within this structure, the formation of polysilicic aluminous pyrophyllite—a mineral with exceptionally strong acid resistance—enables the tiles to withstand more than 99.8% of acid and alkali corrosion at ambient temperature, with hydrofluoric acid and hot phosphoric acid being the sole exceptions. For instance, when used as lining in sulfuric acid storage tanks, these tiles can endure sulfuric acid of any concentration over the long term and remain stable even at elevated temperatures up to 70°C. In flue-gas desulfurization towers at thermal power plants, their temperature resistance spans a broad range from –30°C to 200°C, effectively meeting the demands of hot, acidic environments.

In terms of physical performance, acid-resistant tiles exhibit a compressive strength of ≥120 MPa and a flexural strength of 39.2 MPa, with superior wear resistance compared to conventional tiles, making them suitable for high-load environments. Their water absorption rate is ≤0.5%, significantly lower than the 3%–5% typical of ordinary tiles, effectively preventing acid penetration. In addition, the dovetail groove design on the back of the tile enhances adhesion to the mortar, thereby reducing the risk of delamination over long-term use.

### II. Application Scenarios: Comprehensive Coverage from Chemical Equipment to Environmental Protection Engineering

The application scenarios for acid-resistant tiles virtually cover all highly corrosive environments:

1. **Chemical Industry**: Linings for equipment such as phosphoric acid reaction tanks, sulfuric acid storage tanks, and hydrochloric acid transfer pipelines are required to withstand prolonged contact with high-concentration acidic solutions. For example, a chemical plant installed acid-resistant ceramic tiles measuring 300 × 300 × 15 mm in its reaction tank; after five years of service, no signs of corrosion were observed.

2. **Energy Sector**: Desulfurization towers and flue-gas corrosion-resistant linings in thermal power plants must withstand sulfur dioxide and chlorides in the flue gas. The temperature resistance and chemical resistance of acid-resistant tiles ensure stable operation of the equipment under the combined effects of acidic gases and high temperatures.

3. **Environmental Protection Engineering**: In industrial wastewater ponds and acid–alkali wastewater treatment facilities, acid-resistant tiles can prevent seepage and subsequent soil contamination. One wastewater treatment plant, for instance, installed glazed acid-resistant tiles on the pond walls and used epoxy resin mortar for jointing, extending the service life to more than 10 years.

4. **Pharmaceutical and Food Industries**: In facilities such as fermentation tanks and acid storage warehouses that must meet stringent hygiene standards, the non-contaminating and easy-to-clean properties of acid-resistant tiles make them the preferred choice. For example, a dairy plant has installed underglaze acid-resistant tiles on its floors, which provide slip resistance while facilitating routine disinfection.

### III. Technological Innovation: Upgrading and Iterating from Traditional Materials to Composite Materials

In recent years, technological innovation in acid-resistant tiles has focused on two main areas:

1. **Material Compositing**: The addition of silicon carbide–graphene composite powder increases acid resistance to 99.9% while also enhancing resistance to organic solvent corrosion. According to experiments conducted by a research institute, composite acid-resistant tiles immersed in 98% sulfuric acid for 30 days exhibited a mass loss rate only one-fifth that of conventional materials.

2. **Eco-friendly Production**: Industrial solid wastes such as fly ash and phosphogypsum are used to replace part of the natural raw materials, and chemical reactions are employed to form a dense protective layer that reduces pore connectivity. For example, one enterprise has developed acid-resistant tiles using phosphogypsum, which have reduced the permeability coefficient in acidic media by 60% while lowering production costs by 30%.

### IV. Construction and Maintenance: Details Determine the Long-Term Effectiveness of Corrosion Protection

The corrosion resistance of acid-resistant tiles depends not only on the material itself, but also on proper installation and maintenance:

1. **Construction Specifications**: The substrate must be cleaned with oxalic acid to neutralize alkaline substances, and epoxy resin mortar or potassium water glass mortar is recommended for tiling. The joint width should be controlled at 8–10 mm, and after tiling, the surface must be subjected to a 30% sulfuric acid etching treatment to enhance bond strength. For example, an electroplating plant experienced tile delamination after only two years of service because no acid etching treatment was performed.

2. **Daily Maintenance**: Avoid using strong acidic or alkaline cleaners; instead, use a neutral cleaner and a damp cloth for wiping. Rinse the surface with clean water once a week to remove dirt, and occasionally apply a stain-removing paste to clean the grout lines. If cracks or wear appear, repair them promptly with a matching repair material; for minor scratches, apply toothpaste and then wipe clean.

3. **Environmental Management**: Ensure adequate ventilation and prevent prolonged moisture accumulation. Place protective pads beneath heavy objects or equipment to reduce direct pressure. For example, a chemical plant experienced localized cracking and leakage in the tiles at the bottom of an acid storage tank due to the lack of protective measures.

### V. Future Trends: Deep Integration of Intelligence and Customization

With the advancement of Industry 4.0 and green manufacturing, acid-resistant tiles will evolve toward intelligent and customized solutions:

1. **Intelligent Monitoring**: Embedded sensors continuously monitor the corrosion status of tiles, and data analysis is used to predict replacement intervals, thereby reducing maintenance costs.

2. **Customized Design**: Based on specific corrosive media and temperature conditions, we develop specially shaped bricks—such as wedge-shaped and curved bricks—and functional tiles—such as self-cleaning and antibacterial glazed tiles—to meet the requirements of specialized applications.

From serving as the “lining armor” of chemical equipment to acting as the “corrosion-barrier shield” in environmental protection projects, acid-resistant tiles, with their outstanding performance and continuous innovation, have become the “first line of defense” against corrosion in the industrial sector. Looking ahead, as materials science converges with intelligent technologies, this “invisible guardian” will deliver even greater value, safeguarding industrial safety and supporting sustainable development.