Menu
Search
Filters
Close
Menu

Galvanic Corrosion of Tinned Copper Coupled with Aluminium Alloy in Electric Vehicle

Picture for Galvanic Corrosion of Tinned Copper Coupled with Aluminium Alloy in Electric Vehicle
Available for download

Recently, as environmental regulations have become more severe, the demand for electric vehicles (EV) has increased In the EV system, previously mechanically controlled parts become electrically operated. Accordingly, stable electrical connection between the parts using a wiring harness is becoming more important for reliable operation of the EV. Tinned Cu, whose resistance to both corrosion and wear is excellent, is widely used for wire and terminal for wiring harnesses.

Product Number: 51323-19239-SG
Author: Jeong-Min Lim, Seung-Ho Ahn, Byung-Su Kim, Jung-Gu Kim
Publication Date: 2023
$0.00
$20.00
$20.00

In this study, the galvanic corrosion behavior of the tinned Cu terminal coupled with Al–Mg–Si alloy was analyzed. When the Al, Sn and Cu were exposed to the electrolyte, tri–metallic galvanic corrosion occurred between them. The polarization curves show that the corrosion potential increases in the order: Al < Sn < Cu. Therefore, when the tinned Cu is coupled with Al–Mg–Si alloy, Al alloy with the lowest corrosion potential becomes the anode, while Cu with the highest corrosion potential becomes the cathode. Sn, which has an intermediate potential, becomes either anode or cathode. Since all three metals have steeper cathodic Tafel slopes than an anodic Tafel slopes, the galvanic corrosion rate is determined by the area of cathode. Therefore, the area ratio of Sn and Cu to Al alloy is the main factor affecting the total corrosion rate of the Al–tinned Cu couple. The ZRA results and the Tafel relationship show that the total galvanic corrosion rate increases as the area ratio of Sn plating decreases. Consequently, to prevent failure by corrosion of the connection of the Al body and the tinned Cu terminal, their joining should be performed to minimize damage to the Sn plating.

In this study, the galvanic corrosion behavior of the tinned Cu terminal coupled with Al–Mg–Si alloy was analyzed. When the Al, Sn and Cu were exposed to the electrolyte, tri–metallic galvanic corrosion occurred between them. The polarization curves show that the corrosion potential increases in the order: Al < Sn < Cu. Therefore, when the tinned Cu is coupled with Al–Mg–Si alloy, Al alloy with the lowest corrosion potential becomes the anode, while Cu with the highest corrosion potential becomes the cathode. Sn, which has an intermediate potential, becomes either anode or cathode. Since all three metals have steeper cathodic Tafel slopes than an anodic Tafel slopes, the galvanic corrosion rate is determined by the area of cathode. Therefore, the area ratio of Sn and Cu to Al alloy is the main factor affecting the total corrosion rate of the Al–tinned Cu couple. The ZRA results and the Tafel relationship show that the total galvanic corrosion rate increases as the area ratio of Sn plating decreases. Consequently, to prevent failure by corrosion of the connection of the Al body and the tinned Cu terminal, their joining should be performed to minimize damage to the Sn plating.

Product tags
Also Purchased
Picture for Electrochemical Corrosion Studies of Different Alloys and Cement Lining Material of Water Transmission system
Available for download

Electrochemical Corrosion Studies of Different Alloys and Cement Lining Material of Water Transmission system

Product Number: 51323-19203-SG
Author: Ali Al-Sahary, Fatma Al-Radhi, Abdulrahman Al-Enezi, Nausha Asrar
Publication Date: 2023
$20.00

Saline Water Conversion Corporation (SWCC) is the largest producer of water by its different water desalination plants distributed around the kingdom. Produced water is transmitted through underground pipelines. These pipelines are more than 8,000 KM in length and varying diameter from 8 thru 75 in.
Picture for Electrodeposited Nanolaminar Zinc-Nickel Alloy Coatings – Analysis of Advanced Corrosion Resistance Performance
Available for download

Electrodeposited Nanolaminar Zinc-Nickel Alloy Coatings – Analysis of Advanced Corrosion Resistance Performance

Product Number: 51323-19204-SG
Author: Herman E Amaya, Timm Burnett, Richard Morgan, Vikas Joshi
Publication Date: 2023
$20.00

Nanolaminar or nanostructured zinc-nickel electrodeposited coatings are compliant with the composition requirements of ASTM B841 and F1941 (12 to 16% Ni: balance Zn). The term nanolaminar refers to the successive thin layered deposition of nanostructured grains (≈ 25nm); accomplished by modulating the electrodeposition into a waveform applied at defined time periods and varying current densities. Standard electroplating in contrast, applies a continuous DC current throughout the electrodeposition process, resulting in grains that while initially fine will coarsen as a function of thickness ranging to the micrometer range.
Picture for Selective Degradation and Removal of Silyl-Containing Topcoats from Non-Metallic Substrates using Environmentally Friendly Fluoride Salts
Available for download

Selective Degradation and Removal of Silyl-Containing Topcoats from Non-Metallic Substrates using Environmentally Friendly Fluoride Salts

Product Number: 51323-18797-SG
Author: Erick B. Iezzi, Grant C. Daniels
Publication Date: 2023
$20.00

topcoats utilized on the exterior skin of Department of Defense (DoD) aircraft (i.e., fixed and rotary wing) and ground support equipment (GSE) are two-component (2K) polyurethanes (PUs) that are qualified to MIL-PRF-85285 performance requirements. These topcoats are formed from the chemical MARCH reaction of hydroxyl- and isocyanate-functional molecules to generate highly cross-linked polymeric networks that contain carbamate (i.e., urethane) linkages. Formation of these cross-linked networks result in durable coatings with excellent hydrocarbon resistance, mechanical and thermal properties, including resistance to ultraviolet (UV) degradation from sunlight.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support