Corrosion and Protection in Chlor-alkali Industry Fields such as Brine Purification, Electrolysis of Brine, Cooling and Drying of Chlorine Gas, Hydrogen Chloride, Hypochlorous Acid, Hypochlorites, Bleaching Powder, Vinyl Chloride, Calcium Carbide, and Alkali Concentration (High-Temperature Alkali, Molten Alkali)

The chlor-alkali industry is a large-scale sector and also represents a key end-market for resin-based anti-corrosion solutions, where such applications are particularly concentrated. The Chengdu Eighth Institute likely has the most comprehensive design solutions in this area nationwide. In this post, I’ll briefly summarize the resin-based anti-corrosion solutions used in the chlor-alkali industry.

A Brief Discussion on Corrosion Prevention for Ultra-High-Temperature Flue Gas Ducts/Chimneys

Engineering companies in China that specialize in FC applications are increasingly encountering more challenging issues: namely, the original flue ducts/chimneys of power plants and the original flue ducts/chimneys of boilers. Both of these components operate at exceptionally high temperatures—momentary peak temperatures exceed 200 degrees Celsius, and even under steady-state conditions, temperatures can approach 180 degrees Celsius. Moreover, the substrates vary: some are made of steel, while others are constructed from concrete or reinforced concrete. During actual operation, these systems frequently experience fluctuating temperatures, with sharp and dramatic changes in the operating environment temperature.

In-depth Analysis of the Technical Characteristics of Epoxy Zinc-Rich Primer: Advantages, Limitations, and Precise Application Solutions

As the core primer in industrial heavy-duty anti-corrosion coating systems, epoxy zinc-rich primer—thanks to its excellent cathodic protection performance, adhesion, and corrosion resistance—is widely used in harsh corrosive environments such as steel structures, marine engineering, chemical equipment, bridges, and tunnels.

How can you determine the quality of water-based acrylic paint?

Determining the quality of water-based acrylic paints is a critical prerequisite for ensuring both superior coating performance and optimal service characteristics. This assessment should be conducted comprehensively across multiple dimensions, including visual inspection, verification of core performance attributes, certification by authoritative standards, and evaluation of actual trial-coating results. This approach helps prevent issues such as uncontrolled film thickness and inadequate protective performance that can arise from using low-quality products.

How do you choose the right water-based acrylic paint based on the construction environment?

The construction environment is a critical external factor that influences the performance of waterborne acrylic coatings and the quality of the resulting paint film. Different temperature, humidity, lighting conditions, and corrosive media environments significantly affect the coating’s core performance characteristics, including film-forming ability, drying speed, weather resistance, and corrosion resistance. Therefore, selecting the right coating type precisely based on the specific construction environment is the key prerequisite for avoiding quality issues such as uncontrolled film thickness, wrinkling, cracking, and peeling.

The key difference between single-component vs. two-component paints!

The core difference between single-component paints and two-component paints lies in their compositional makeup and curing mechanisms, which in turn give rise to differences in performance, application processes, and suitable use scenarios.

Application Scenarios for Single-Component vs. Two-Component Paints

Single-component paints excel in ease of application, low cost, and convenient storage, making them ideal for low-demand decoration or repair work. In contrast, two-component paints, with their chemically cured high performance, outperform single-component paints in terms of hardness, corrosion resistance, and weather resistance, making them the preferred choice for industrial and highly durable coatings. However, they come with a higher application threshold and are also more expensive.

How do you choose the right type of paint?

When choosing the right type of paint, the key is to focus on four critical factors—application scenario, substrate type, performance requirements, and construction conditions—and make your decision by taking into account the characteristics of both single-component and two-component paints.

Fire-retardant coatings are a type of specialized coating that provides flame-retardant and fire-protection functions.

Fire-retardant coatings are a special type of coating that provides flame-retardant and fire-protection functions. After being applied to the surface of a substrate, they form an insulating protective layer under high-temperature fire conditions, slowing down the substrate's temperature rise, inhibiting the spread of fire, and reducing the substrate's combustibility. They are commonly used for fire protection of architectural and industrial components such as steel structures, concrete, and wood.

Coating Defect Detection

In the protection of large-scale structures such as bridges, storage tanks, and pipelines, coating systems act like a “shield”—a protective armor that effectively blocks external corrosion and significantly extends the service life of these structures. However, if this “armor” contains discontinuities—such as pinholes or missed coatings—it can become a hidden “entry point” for structural degradation. Oxygen and electrolytes from the outside environment can seep through these gaps into the substrate, causing corrosion of the metal base material and seriously compromising the structure’s safety and durability. Today, we’ll talk about how to identify these hidden coating defects through scientific testing.