Busan 11 M1 for Improved Steel Anti-Corrosion
- July 15, 2020
- Posted by: Amanda Mui
- Category: BLOG, Coating, Coating ST, ST, Surface Technology
There are many approaches to achieving a good anti-corrosion system for steel. Some of which include: ICCP (impressed current cathodic protection), choosing electronegative-friendly metals during the design, including the use of sacrificial anodes and of course, coatings.
All gearing towards saving the installation from material loss. These anti-corrosion systems are installed in ships, transmission towers, bridges, oil, power and chemical plants and other essential infrastructures.
The choice of which system to use will be dictated by several factors:
1. Service Environment
The service environment where the steel structure will be installed will limit the choices that should be considered. It will also dictate the maintenance checks that will be required to check up the installation, how accessible structure will be and the required frequency of these maintenance checks.
Alongside the maintenance checks, what kind of repair and maintenance works will be required to keep the structure in good working condition.
Lastly, and might be most important of all for the stakeholders is, what the initial cost investment be for the installation. This will also dictate the costs spent for the duration of the whole span of its service life, affecting the total cost of ownership to build, maintain and operate the installation.
Organizations, like SSPC, NACE or FROSIO, has categorized these service environments. They are broken down these according to exposure to different pH levels, moisture, temperature, chemicals.
2. Expected Service Life
The asset will have an expected service life, and one of the goals of anti-corrosion systems put in place in these installations is to make sure that the installation will last the whole course of its service life.
Aside from periodic maintenance and upkeep down times, catastrophic failures and unscheduled downtimes are best avoided to maximize the investment poured into these installations.
The main goal of maintenance is to make sure that the installation is reliable throughout its service life and that operations will be unhampered without worrying about safety and productivity.
The expected output of these installations is paramount to the maintenance principles that will be employed by the stakeholders. As there are many approaches to maintaining installations, stakeholders can choose from run-to-failure approaches to planned/preventive maintenance to condition-based monitoring.
Choosing which approach to take will require certain competencies of personnel on the ground level running the maintenance programs.
4. Anti-Corrosion Coatings
Technologies involving anti-corrosion coatings are varied in terms of approach. Pairing different resins with different anti-corrosion pigments and additives will have different corrosion resistance performance. Whether you go for cathodic protection or barrier effects, or better, the combination of these two to come up with an effective coating system that will protect an asset, epoxies, amido-amines, epoxy esters are among a few resin choices.
There is a myriad of possible permutations that can be devised depending on the severity of the service environment. The versatility of barium metaborate in formulations using anti-corrosion pigments and barrier effect pigments/extenders are proven in many scholar publications. It is also a safer choice compared with other pigments containing heavy metals and its compounds.