Effect of magnetic field on corrosion behavior of X70 pipeline steel
with V- groove flaws
Abstract
Whereas this magnetic flux leakage classifier assured the safe operation
of in-service pipelines, its magnetization impact might affect pipeline
steel corrosion, particularly for pipelines with flaws in service. In
this paper, the weight loss method, AC impedance technique,
potentiodynamic polarization technique,X-ray photoelectron spectroscopy
(XPS), and finite element simulation were used to analyze the impact of
magnetic field (MF) on the corrosion behavior of high-strength pipeline
steel with V-groove flaws in Ku’erle simulated solution. The vertical MF
increased corrosion near the left end of a V-groove slot in the
Y-direction while inhibited corrosion on the right. And the
perpendicular and parallel MF induced corrosion externally to the
V-groove slot while inhibiting corrosion within the V-groove slot.
Moreover, perpendicular and parallel MF on corrosion system are mainly
due to magnetic field gradient force, whereas vertical MF is mainly
related to Lorentz force.