The contact angle is very useful to ensure reproducibility because it is a fast and sensitive method to check "is the surface I prepared the same as as before?"

If your contact angle has a large error bar, the reproducibility check becomes more work because slower methods need to be applied.

The surface energy and contact angle measurement determines the wettability nature of the metal surface i.e. hydrophilicity or hydrophobicity of the surface and thereby inhibits the corrosion rate accordingly