In contrast to dry corrosion, in which the material dissolves in a gas, wet corrosion refers to the solution of the material in a liquid. The degree of corrosion varies depending on the combination of liquid components and materials (including anti-corrosion measures such as coatings).
Countermeasures
After a certain period of use, it is necessary to perform the following inspections and evaluations to prevent fracture:
- Subcategory: Wet Corrosion
- Damage mode: Metal loss (Thinning)
- Inspection: Visual inspection, measurement of metal thickness.
- Evaluation: Prediction of metal thinning rate, assessment of remaining service life.
- Actions: Establish criteria for metal buildup repair, component replacement, and material change based on the assessment.
There are many detail mechanisms for wet corrosion. Followings are recommended for plant maintenance countermeasures;
> To confirm the detail mechanisms by using FPAI Class 2
> To implement the countermeasures suggested