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Guide to the best abrasive selection for shipbuilding and large steel structure anti-corrosion projects

31/7/2025

In shipbuilding and large steel structure anti-corrosion projects, the selection of abrasives needs to be combined with factors such as rust removal efficiency, surface quality, environmental protection and cost. The advantages and applicable scenarios of different abrasives are significantly different, as follows:

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Mainstream abrasive types and characteristics:(Advantages and applicable scenarios)
Steel shot/steel grit
- The rust removal efficiency is extremely high, and it can quickly remove thick oxide scale and rust, which is suitable for high-intensity operations such as hull steel plate pretreatment;
- The surface roughness is controllable (anchor pattern depth 50-100μm), and the adhesion of the anti-corrosion coating is highly matched;
- It can be recycled and reused , and the long-term cost is low.
- Applicable scenarios: shipbuilding (such as hull sections, cabin structures), large bridges and other high-corrosion grade steel structures.
garnet sand
- The hardness is close to steel sand, the rust removal efficiency is excellent, the dust is small (no free silicon), and it meets the environmental protection requirements of open-air operations;
- There is no salt residue after surface treatment, which does not affect the adhesion of the coating, and it is suitable for scenes with high cleanliness requirements such as ship repair.
- Applicable scenarios: large steel structures with strict environmental protection requirements (such as chemical storage tanks) and open-air segmental rust removal of ships.
Copper slag (such as copper silica sand, processed from copper smelting waste slag)
- High hardness, rust removal effect can reach Sa2.0~Sa3.0 level, no risk of silicosis;
- High cost performance: as an industrial waste slag recycling product, the raw material cost is low.

- Applicable scenarios: pretreatment of non-load-bearing components (such as railings, brackets) and temporary transition coatings in shipbuilding (rust removal level Sa2.0 is sufficient), no deep anchor pattern is required; short-term anti-corrosion projects (lifespan within 10 years) of large steel structures (such as factory steel columns, ordinary storage tanks), or projects with limited budgets.

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Core Differences:

Steel shot/steel sand:"extreme in performance"; garnet sand :"extreme in environmental protection";copper slag : "extreme in cost", which correspond to the different requirements of "high requirements for key parts, environmentally sensitive areas, and low cost for non-key parts" in the project.

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