Research on the electrical contact degradation model of plug-in connectors under corrosion and wear

2021 ◽  
Vol 11 (5) ◽  
pp. 758-765
Author(s):  
Peng Wang ◽  
Liangjun Xu
Keyword(s):  
Contact Resistance ◽  
Influencing Factors ◽  
Atmospheric Corrosion ◽  
Electrical Contact ◽  
Degradation Process ◽  
Cumulative Distribution ◽  
Atmospheric Environment ◽  
Corrosion Mechanism ◽  
Degradation Model ◽  
Corrosion Spot

Failures due to corrosion are common for connectors operating under atmospheric environment. Results of previous studies lacked universal applicability and neglected the degradation process of contact resistance. Also, wear is rarely considered in studies on corrosion degradation, which is an inevitable mechanical process for plug connectors. Considering these problems, the atmospheric corrosion process and copper dynamics were analyzed. The consistency of the atmospheric corrosion mechanism was used to study the local corrosion degradation law and its influencing factors. The wear mechanism on corrosion degradation was determined through the analysis of the influencing factors. The corrosion model of the gold-plated parts under atmospheric wear was established. To study the degradation process of electrical contacts, a degradation model of contact resistance based on the multi-spot contact mechanism was established combined with the previous corrosion degradation model. Experimentally, the corrosion spot density increases as a function of time and varies with plated thickness, whereas the corrosion spot size distribution is still relatively independent of time. The skew phenomenon appears in the cumulative distribution probability of contact resistance as exposure time increases. Whereas the degradation of electrical contact resistance increases as a function of time, the median remains relatively unchanged. A brief analysis of the contact reliability under wear and corrosive environments was also carried out.

Study on the Wear and Abrasion Effect of Metal Nano-Coating Plug Connectors Under Atmospheric Corrosion Conditions

2020 ◽  
Vol 12 (8) ◽  
pp. 1006-1014
Author(s):  
Peng Wang ◽  
Liangjun Xu
Keyword(s):  
Contact Resistance ◽  
Atmospheric Corrosion ◽  
Sliding Friction ◽  
Electrical Contact ◽  
Key Factors ◽  
Actual Usage ◽  
Positive Effects ◽  
Nano Coating ◽  
Resistance Degradation ◽  
Corrosive Environments

The plug connector is the most widely used type of separable connector; however, the sliding friction that occurs during the plug-in process causes wear and wiping effects. Wear is a form of damage that occurs to the anti-corrosion coating during the sliding process, and wiping refers to the cleaning effect of corrosion products during the sliding process. Both have negative and positive effects on electrical contact reliability in corrosive environments. Therefore, wear and wiping are key factors in studying the life and reliability of connectors in atmospheric corrosion environments. Atmospheric corrosion is the main mechanism leading to connector contact failure. There have been many related studies on simple connector atmospheric corrosion, but research on the influence of wear and wipe on atmospheric corrosion and the influence of contact resistance degradation is still not comprehensive. To study the influence of wear and wiping on contact reliability during the plug connector-mating process, this work evaluates the metal nano-coating connector plugging process as the object, and the contact resistance degradation model under atmospheric corrosion as the basis, and the effect of wear and wiping on corrosion degradation as the research tool. Ultimately, the influence of wear and wiping on contact resistance is studied in detail. Finally, combined with the actual usage of the plug-in connector, the contact reliability of metal nano-coating plug connectors under the action of abrasion and wiping is studied.

scholarly journals Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 517
Author(s):  
Bin Sun ◽  
Lei Cheng ◽  
Chong-Yang Du ◽  
Jing-Ke Zhang ◽  
Yong-Quan He ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Oxide Scale ◽  
Corrosion Product ◽  
Corrosion Behavior ◽  
Corrosion Test ◽  
Atmospheric Corrosion ◽  
Corrosion Mechanism ◽  
Type I ◽  
Rust Layer ◽  
Hot Rolled

The atmospheric corrosion behavior of a hot-rolled strip with four types (I–IV) of oxide scale was investigated using the accelerated wet–dry cycle corrosion test. Corrosion resistance and porosity of oxide scale were studied by potentiometric polarization measurements. Characterization of samples after 80 cycles of the wet–dry corrosion test showed that scale comprised wüstite and magnetite had strongest corrosion resistance. Oxide scale composed of inner magnetite/iron (>70%) and an outer magnetite layer had the weakest corrosion resistance. The corrosion kinetics (weight gain) of each type of oxide scale followed an initial linear and then parabolic (at middle to late corrosion) relationship. This could be predicted by a simple kinetic model which showed good agreement with the experimental results. Analysis of the potentiometric polarization curves, obtained from oxide coated steel electrodes, revealed that the type I oxide scale had the highest porosity, and the corrosion mechanism resulted from the joint effects of electrochemical behavior and the porosity of the oxide scale. In the initial stage of corrosion, the corrosion product nucleated and an outer rust layer formed. As the thickness of outer rust layer increased, the corrosion product developed on the scale defects. An inner rust layer then formed in the localized pits as crack growth of the scale. This attacked the scale and expanded into the substrate during the later stage of corrosion. At this stage, the protective effect of the oxide scale was lost.

Discrete drops in the electrical contact resistance during nanoindentation of a bulk metallic glass

2016 ◽  
Vol 108 (18) ◽  
pp. 181903 ◽  
Author(s):  
Gaurav Singh ◽  
R. L. Narayan ◽  
A. M. Asiri ◽  
U. Ramamurty
Keyword(s):  
Metallic Glass ◽  
Contact Resistance ◽  
Bulk Metallic Glass ◽  
Electrical Contact ◽  
Electrical Contact Resistance

scholarly journals The Wear Process During the “Running-In” of Steel in Lubricated Sliding

1987 ◽  
Vol 109 (4) ◽  
pp. 587-591 ◽  
Author(s):  
M. Suzuki ◽  
K. C. Ludema
Keyword(s):  
Contact Resistance ◽  
Surface Film ◽  
Electrical Contact ◽  
Mineral Oil ◽  
Entrance Region ◽  
Engine Oil ◽  
Small Range ◽  
Electrical Contact Resistance ◽  
Metallic Contact ◽  
Wear Process

Steel cylinders were slid against flat steel disks, using a liquid lubricant, in order to study the progression of events associated with “running-in.” It was found that, when using mineral oil, the electrical contact resistance varied over a small range of high values indicating no metallic contact, whereas with engine oil a high resistance with an intermittent negligible contact resistance was found. A surface film forms from the additives in the engine oil which produces lower wear, slightly higher friction, a retarded running-in, and a rougher surface finish in the direction of sliding than does the mineral oil. A film which is composed only of Fe3O4 is formed when mineral oil is used. In addition, the mineral oil lubricated surfaces develop a conforming waviness across the sliding tracks. The oxide must have enhanced this surface conformity since it was not seen in the surfaces lubricated with engine oil. The role of the oxide may be further seen in experiments in which wear debris that accumulated in the entrance region of specimen contact was removed at frequent intervals. Little conforming waviness was seen in the latter case, suggesting that oxide which gathered in the entrance region abraded grooves in the steel surfaces. After the oxides were dislodged the friction increased and the contact resistance decreased for a time, indicating that the oxide acted like a solid lubricant.

Simultaneous Electrical and Thermal Modeling of a Contact-Type RF MEMS Switch

2003 ◽  
Author(s):  
Brian Jensen ◽  
Zhongde Wang ◽  
Kazuhiro Saitou ◽  
John L. Volakis ◽  
Katsuo Kurabayashi
Keyword(s):  
Contact Resistance ◽  
Direct Contact ◽  
Rf Mems ◽  
Bulk Material ◽  
Thermal Contact ◽  
Electrical Contact ◽  
Maximum Temperature ◽  
Electrical Contact Resistance ◽  
Rf Mems Switch ◽  
Mems Switch

Improving the power handling capability of direct contact RF MEMS switches requires a knowledge of conditions at the contact. This paper models the temperature rise in a direct contact RF MEMS switch, including the effects of electrical and thermal contact resistance. The maximum temperature in the beam is found to depend strongly on the power dissipation at the contact, with almost no contribution from dissipation due to currents in the rest of the switch. Moreover, the maximum temperature is found to exceed the limit for metal softening for a significant range of values of thermal and electrical contact resistance. Since local contact asperity temperature can be hundreds of degrees higher than the bulk material temperature modeled here, these results underscore the importance of understanding and controlling thermal and electrical contact resistance in the switch.

Sign in / Sign up

Export Citation Format

Share Document