1、 Corrosion Challenges and Economic Losses in Marine Engineering

The annual economic losses caused by marine corrosion in our country are about 700 billion yuan, accounting for one-third of the total corrosion losses.

The corrosion is most severe in the splash zone of waves, involving coupled damage from multiple factors such as salt, oxygen, and wave impact. Key components such as steel pipe piles are prone to failure.

2、 Core advantages of corrosion-resistant tungsten alloy rods

1. Super corrosion resistance

2. The high density and chemical inertness of tungsten alloy can effectively resist chloride ion erosion and microbial corrosion, with a critical pitting temperature more than 30% higher than traditional stainless steel.

In simulating deep-sea environments, the corrosion rate is less than 0.01mm/year, much lower than the 0.1mm/year of 316 stainless steel.

3. Mechanical performance and durability

Tensile strength ≥ 750MPa, yield strength ≥ 300MPa, elongation ≥ 30%, meeting the requirements of deep-sea high-pressure and polar low-temperature environments.

The single-phase solid solution structure avoids intergranular corrosion and maintains uniform corrosion resistance after welding.

3、 Batch application scenarios and effects

1. Ships and offshore platforms: used for critical components such as propeller shafts and bearings, with a lifespan of over 20 years.

2. Subsea pipelines and equipment: Combining special welding materials to solve high-pressure sealing and cracking problems.

3. Economy: Compared to traditional materials, the maintenance cycle is extended by 5 times, and the total lifecycle cost is reduced by 40%.

4、 Technological breakthrough direction

Composite coating technology: such as the fiber-reinforced coating developed by the Chinese Academy of Sciences, which can be used in conjunction with tungsten alloy to enhance erosion resistance.

Material gene regulation: Through processes such as nitrogen microalloying, the self-healing characteristics of passivation films are achieved.