An integral non-intrusive electrochemical and in-situ optical technique for the study of the effectiveness of corrosion inhibition

Operando Surface Optical Reflectance Microscopy Study of Corrosion Film Growth on a Ni–Cr–Mo Alloy During Anodic Polarization

“…2D-SOR has previously been used to study the corrosion of duplex stainless steel, 20 the anodization of aluminum, 24 the local corrosion of aluminum alloys, 25−28 the electrooxidation of gold, 20,24,29 and corrosion inhibition. 30,31 Here we demonstrate the additional capabilities of this affordable and straightforward technique. During wet corrosion of the Ni−Cr−Mo alloy at high anodic potentials, we detect films of corrosion products forming on the surface.…”

“…We use an emerging optical technique termed 2-Dimensional surface optical reflectance (2D-SOR) microscopy − (also known as reflectance microscopy), to follow the corrosion initiation and progression in operando conditions with high temporal and spatial resolution. 2D-SOR has previously been used to study the corrosion of duplex stainless steel, the anodization of aluminum, the local corrosion of aluminum alloys, − the electrooxidation of gold, ,, and corrosion inhibition. , Here we demonstrate the additional capabilities of this affordable and straightforward technique. During wet corrosion of the Ni–Cr–Mo alloy at high anodic potentials, we detect films of corrosion products forming on the surface.…”

Effect of Delayed Inhibitor Supply on Aa2024-T3 Intermetallic Activity: A Local in Situ Analysis with Reflected Microscopy

“…Commercial grade bare AA2024-T3 (Kaiser Aluminium, rolled thickness = 2 mm) was used for the corrosion tests. Epoxy-embedded metal samples (EMS) with an exposed metal surface area of approximately 500 ×500 μm 2 were prepared from the metal sheets using a procedure described in earlier works [14,33]. Additional details on the preparation of the EMS are also provided in Supporting Information 1.…”

“…The experimental protocols used were adopted from earlier works [14,33]. The EMS surface was ground with SiC sandpaper from 320 to 4000 grit.…”

Small Concentrations of Nacl Help Building Stable Inhibiting Layers from 2,5-Dimercapto-1,3,4-Thiadiazole (Dmtd) on Aa2024-T3

“…Despite the high levels of protection and relatively good collective understanding on how these layers are formed, recent reports suggest that cerium-based layers do not continuously protect under specific re-exposure conditions. For instance, cerium-rich inhibiting layers on AA2024-T3 formed from 0.05 M NaCl with 1 mM Ce(NO 3 ) 3 become reversible, or inefficient, in a relatively short re-immersion time ranging from 0.5 to 5 h when the samples are re-immersed from the inhibiting solution directly into a non-inhibited 0.05 M NaCl solution [12].…”