What is corrosion and why is protection necessary?
Corrosion is a chemical or electrochemical process in which metals react with their environment and gradually lose material. In practice, this manifests itself in rust formation, pitting, stress corrosion or galvanic corrosion.
In sectors such as the process industry, offshore, mechanical engineering and power generation, corrosion can have direct consequences for operations, including:
Reduced mechanical strength of components- Accelerated wear and loss of function- Leaks or failure of critical parts- Higher maintenance and replacement costs
Well-designed corrosion protection is therefore essential to keep installations operating reliably and safely.
Overview of corrosion-resistant coatings
The comparison below shows how different coating types relate to each other in terms of protection and service life.
| Coating type | Corrosion protection | Wear resistance | Bonding | Service life |
|---|---|---|---|---|
| Conventional barrier coatings | Low to medium | Low | Mechanical | Limited |
| Galvanizing | Medium | Low | Metallurgical | Medium |
| Thermal spraying | Medium to high | Medium | Mechanical | Medium |
| Laser cladding | Very high | Very high | Metallurgical | Very high |
For components that are subject to dynamic loading or long-term exposure to aggressive media, conventional coatings often do not provide sufficient long-term protection.
Laser cladding as a corrosion-resistant coating
Laser cladding is used when conventional coatings fall short. The process applies a pore-free, metallurgically bonded protective layer that locally fuses with the base material. This creates a structural improvement of the surface instead of a temporary barrier. Laser cladding is therefore more than an anti-corrosion measure. It is a structural materials solution.
The laser-clad layer is resistant to both corrosion and wear and retains its properties under severe mechanical and chemical loading. Due to the localized heat input, distortion is limited and dilution of the base material remains minimal.
Key benefits of laser cladding as a corrosion-resistant coating include:
- Very high resistance to corrosion and wear
- Homogeneous microstructure without porosity
- Metallurgical bond without risk of delamination
- High dimensional accuracy, suitable for new components and refurbishment
Corrosion-resistant coating or material substitution?
To prevent corrosion, stainless steel or high-grade alloys are often selected. This is a logical choice, but not always the most efficient or best-performing solution.
With laser cladding, only the surface is reinforced with a wear- and corrosion-resistant layer, while the base material is retained. This makes it possible to achieve properties that in many cases outperform standard stainless steel, for example under aggressive corrosion or combined wear. An important advantage is that reinforcement can be applied very selectively: only where it is needed. This saves material, reduces costs and shortens lead time. From a Total Cost of Ownership perspective, laser cladding is therefore often a smarter and more sustainable choice.
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