Effect of the calcareous deposits on the cathodic protection potential of 10Ni5CrMoV high‐strength steel in a deep‐sea environment by using the response surface methodology

Abstract

The effect of deep-sea environments on the properties of calcareous deposits was studied and we established the mapping relationship between their cathodic protection potential and the temperature (T), pressure (P), dissolved oxygen (DO), and the properties of the calcareous deposits according to the response surface methodology. This revealed that the calcareous deposits mixed with CaCO 3 and Mg(OH) 2 under cathodic protection. The environment including temperature, pressure, and oxygen content had various impacts on the thickness, porosity, and the ratio of Ca and Mg. Moreover, the calcareous deposits slightly decreased the cathodic protection potential. Therefore, it can be believed that the cathodic protection potential for naked high-strength steel is also approximately applicable to that covered with calcareous deposits in the deep-sea environment.

Modeling of the corrosion behavior of B30 alloy in a deep‐sea environment by using the response surface methodology

“…When the p > 0.1, the model factor has no significant effect. [ 50 ] Accordingly, the significance of the factors for i corr is as follows: T (temperature) > DO (dissolved oxygen) > V (flow rate) > P (pressure). Moreover, the interaction effects between any two individual factors are statistically not significant.…”