Deliquescence of NaCl and Atmospheric Corrosion of 316L Stainless Steel

Ahmed Al Mehrzi; Yong Sun Yi; Pyung Yeon Cho; Sara Al Saadi; Ji Sung Lee; Daniel S. Choi

doi:10.4028/www.scientific.net/AMR.1142.8

Paper Titles

Preface, Committees, Sponsor

The Valence Electron Structure of High-Entropy Alloys
p.3

Deliquescence of NaCl and Atmospheric Corrosion of 316L Stainless Steel
p.8

Research on the Structure of GdFeMn Compound
p.14

Role of Bulky Retained Austenite in Austempered Ductile Iron
p.19

Effect of Frequency on the Fatigue Behavior of IN718 Superalloy
p.23

Study on the Performances Properties of Medical Pure Magnesium by Ion Implantation of Nitrogen
p.31

Phase Purity and Thermoelectric Properties of Type-I Clathrates Ba₈Cu_xSi_yGe_46-x-y (4 ≤ x ≤ 6.5, y = 0 and 5.15 ≤ x ≤ 6.425, 2.05≤ y ≤ 36.9)
p.37

Magnetic Properties and Magnetocaloric Effect of Nd_0.7Gd_0.3Mn₂Si₂ Alloy
p.47

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Deliquescence of NaCl and Atmospheric Corrosion of 316L Stainless Steel

Abstract:

Water droplets formed by the deliquescence of pre-deposited NaCl on 316L stainless steel were investigated. Different total weights of NaCl particles between 0.0005 g and 0.01 g were deposited on 316L stainless steel surface, which were exposed to an atmospheric condition at 80oC and relative humidity of 80% until NaCl droplets were stabilized. The volume of NaCl droplet was linearly proportional to the total weights of pre-deposited NaCl and consequently the chloride concentration in droplets, ranging from 3 to 6 M, did not depend on the NaCl weights. After exposed to the NaCl droplets at 80oC and relative humidity of 80% over 5, 10, and 15 days, all 316L stainless steel samples suffered from pitting. The Cl^- ions in the surface films of samples were measured by ToF SIMS. The pit densities on samples were well correlated with the Cl^- intensities in the surface films. These results suggest that the pit initiation under NaCl droplets by deliquescence is caused by the Cl^- ions either incorporated into surface films or penetrated through them.