Surface plus
By means of an extended method of test - surface protection plus - the materials are tested at system level, i.e. the complete product and not just the component part is tested in the respective range of application.
- Geometric influences are taken into consideration
- Testing with real test media
- Optimum material selection and combination
- Test method for corrosion protection (component-oriented and design-oriented)
Dependance of corrosion on local ambient conditions, e.g. corrosion rate for low alloyed steel.
| Average corrosion rates in µm/year | |||
| North Sea | Mediterranean | Persian Gulf | |
| Atmosphere | 50-70 | ||
| Splash water zone | 140 | 140 | 190 |
| Alternate immersion zone | 80 | 50 | 50 |
| Low water zone | 210 | 160 | 130 |
| Static immersion zone | 30 | 40 | 40 |
| Sea bed | 20 | ||
Test methods for corrosion protection
- according to current regulations e.g. EN, IEC, ASTM
Benefit: same scale, comparable
Disadvantage: merely component-oriented (for example sheets only)
Extended test methods (Rittal)
- Testing on system level (complete product instead of component parts)
- Geometric influences are tested as well (edges, gaps,...)
- Testing with real test media
Benefit: Practice-oriented, optimum material selection and combination in the respective field of application (coated steel, stainless steel, aluminium, zinc).
Constructive corrosion protection:
- Prevention and sealing of gaps
- Appropriate pairs of material
- Organic coating as far as possible
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