Service Life Prediction of Chemical Corrosion Tank Plates

Product name:Service Life Prediction of Chemical Corrosion Tank Plates
Keywords:Service Life Prediction of Chemical Corrosion Tank Plates
Industry:Petroleum, natural gas and chemical industry - Chemical industry
Process:Sheet metal - Bending
Material:Carbon steel

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Product details

Corrosion Mechanism and Key Factors
The service life of chemical tank plates is mainly affected by electrochemical corrosion (pitting rate ≥ 0.5mm/year) and stress corrosion cracking (SCC). The pH value of the medium (range 2-12), Cl⁻ concentration (critical value > 50ppm), and temperature (corrosion rate doubles for every 10°C increase) are the three core variables.

Prediction Model Construction
Using Arrhenius accelerated experiments combined with finite element simulation, corrosion kinetics equations are established through weight loss method (accuracy ±0.1mg) and ultrasonic thickness measurement (resolution 0.01mm). The prediction error in typical industrial environments can be controlled within ±15%.

Service Life Extension Technologies
Gradient coatings (such as PTFE+Al₂O₃ composite layer) or cathodic protection (potential -0.85V to -1.2V) are recommended. Laboratory data shows that they can extend the service life by 3-5 times. Eddy current testing is required quarterly to calibrate the model.

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