Abstract
In the current investigation, corrosion behavior and microstructural variations of explosion-welded joint of bronze-carbon steel dual-layer plates were studied. The resultant curves of potentiodynamic's polarization tests demonstrated that the lowest corrosion rate was related to the sample with maximum explosive load thickness, and the highest corrosion speed was for the sample with minimum standoff distance. EIS test results of welded samples were indicative of creating a passive layer at the beginning of immersion process which showed that the polarization resistance has been reduced by increasing of explosive load thickness. So, the corrosion mechanism included two stages; at the beginning of immersion, for the samples with the lower thickness of explosive load, a passive layer would be created around the component due to higher concentration gradient and then, by removing of this layer, the galvanic couple determines the corrosion rate.
Highlights
Explosion welding is a process that utilizes the explosion energy to form a metallurgical bond by electron sharing among two components which kept at specified standoff distance
Two solidified joint interfaces of metal-metal and metal-liquid could be formed at the joint interface
It is essential to use a constant phase element (CPE) instead of capacitor non-ideal behavior of dual layer due to distribution of relaxation time caused by the available surface roughness (Micro or Nano) such as boisterous, porous layer, impurities, preventing absorption, diffusion and etc. to obtain more precise accordance
Summary
Explosion welding is a process that utilizes the explosion energy to form a metallurgical bond by electron sharing among two components which kept at specified standoff distance. Forming of the jet is the basic cause of suitable bonding in explosion welding This welding process is a non-fusion route (solid-state) that used to join and cladding the similar and dissimilar metals, industrially, in the forms of dual or multilayers. Very low investigations were performed about the corrosion behavior of explosion-welded joints that as following: Kengkla and Tarlp[5] studied the effect of intermetallic compounds on corrosion behavior of threeply explosion welded joint of aluminum/steel for military industries. Their results demonstrated that the forming of intermetallic compounds of Al3Fe and Al5Fe2 at joint interface caused a cathodic potential toward aluminum and anodic potential to steel. And cooperators[6] investigated the Materials Research
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