Initial Stage Monitoring of Pitting Corrosion of 1Cr18Ni9Ti Stainless Steel in Sodium Chloride Solution Using ESPI

Pitting corrosion of 1Cr18Ni9Ti stainless steel had been monitored by electronic speckle pattern interferometry (ESPI).Microscopy and atomic force microscopy were used to investigate the sample surface and microstructure of the corrosion pit.It was concluded that the speckles in ESPI were caused by the pitting corrosion products.The results indicated that ESPI could be carried out in-situ and with the features of real time,full field,non contact,high resolution and continuous detection for monitoring the initial stage of pitting corrosion of 1Cr18Ni9Ti steel in 3.5% NaCl solution.