It is well known that piping made of carbon or low-alloy steel is
always suffering fromcontinuouswall thinning causedby corrosion
[1] and, consequently, piping trouble often occurs in industry. For a
long term, people have been paying more attention to the internalpipeline
corrosion. In recent years, monitoring of internal-pipeline
corrosion process becomes an important research topic due to its
technical and economical impacts.