Anti-Corrosion Chain Testing Standard - Salt Spray Test
| Why does the chain need to do the salt spray test?
Carbon steel chains have good strength and wearing resistance. However, in corrosive environment, the chains are easily got rusted. Most of the corrosion is caused by the exposure to atmospheric environment, and the most common and destructive is salt spray corrosion.
With the advancements in metal anti-corrosion technology, MCC has introduced various anti-corrosive coatings, including nickel plated, zinc plated, GN, CRF coatings and so on.
To assess the protection ability of coating against the corrosion, a testing method that is fair and close to corrosive condition of natural environment is necessary.
Since salt spray corrosion is the most common factor lead to rusted metal, scientists have developed Salt Spray Test (SST) to simulate the severely corrosive condition and examine the rusted process. Currently, the salt spray is one of the most widespread corrosion testing methods.
Extended Reading
| Salt Spray Testing Standard
| ASTM B117 | ISO 9227 | |
| Density, g/cm3 | 1.024286-1.037261@25°C | 1.029-1.036@25°C |
| Mass of NaCl required per 1 L | 53 ± 10.6 g | 50 ± 5 g |
| Electrical conductivity | Max 5.0 µS/cm at 25°C | Max 20 µS/cm at 25 °C ± 2 °C |
| Allowable Limits for Impurity Levels in Sodium Chloride | Total impurities ≦0.3% Halides (bromide, Fluoride and iodide) ≦0.1% Copper < 0.3 ppm Anti-caking agents none added | Total impurities≦0.5% Copper +Nickel +Lead≦0.005%(50ppm) Sodium iodide≦0.1% Anti-caking agents none added |
| Specimens suspended angle | 15-30° | 15-25° |
| Salt concentration | 5% | |
| pH range | 6.5 to 7.2 | |
| Temperature | 35 +/- 2°C | |
| Atomization and Quantity of Fog | For each 80 cm2 of horizontal collecting area, there will be collected from 1.0 to 2.0 mL of solution per hour. | |
| Salt Spray Testing Method
1. Pictures of salt spray machine
2. Working principle of salt spray test machine
| Salt Spray Test Result
| Application
- Ensure the quality of anti-corrosive coating : Make sure chains’ anti-rust performance reach the standard.
- Improve the anti-rusted performance: When improving the anti-corrosion coating, salt spray is used to find the best process.
- Develop new coating : With the continuous development of corrosion resistant technology, salt spray test is the best method to examine the performance of new coating..
- Examine the chain lubricant protection against corrosion
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