Contactor Iron Core with Sacrificial Rod for Salt Fog Corrosion
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Solution Overview
Problem
Existing contactors experience corrosion of their iron cores in salt fog environments, leading to increased air gaps between movable and stationary cores, which reduces retention force without the use of anti-rust coatings that further exacerbate the issue.
Innovation Solution
An iron core design incorporating a metal rod made of aluminum, aluminum alloy, magnesium, magnesium alloy, zinc, or zinc alloy that penetrates silicon steel sheets, forming a sacrificial anode to protect the steel from corrosion while maintaining core retention force by using sacrificial cathodic protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-rust layer is plated on the surface of the iron core, then the corrosion resistance is improved, but the air gap between the movable iron core and the stationary iron core increases, leading to decreased retention force
Solution Approach 1:
A zinc alloy layer is introduced as an intermediary protective layer between the iron core and the corrosive salt fog environment. The zinc alloy layer serves as a sacrificial anode that corrodes preferentially, protecting the underlying iron core without adding significant thickness that would increase the air gap and reduce retention force.
Solution Approach 2:
The zinc alloy layer acts as a consumable protective barrier that sacrifices itself to protect the more valuable iron core. The zinc alloy corrodes in place of the iron core, providing long-term protection while maintaining the dimensional integrity of the core components.
2Ease of manufacture
If the surface of the iron core is coated with oil, then the cost is reduced, but the air gap between the movable iron core and the stationary iron core is still increased, leading to decrease of the retention force
Solution Approach 1:
The zinc alloy layer serves as a permanent structural intermediary that provides corrosion protection without the dimensional instability associated with oil coatings. This mediator layer maintains consistent thickness and does not significantly increase the air gap, unlike oil coatings that can add variable thickness.
3Adaptability or versatility
If the iron core is used in salt fog environment, then the contactor operates in harsh conditions, but the iron core is corroded by salt fog, leading to increased air gap and decreased retention force
Solution Approach 1:
The zinc alloy layer is designed to be sacrificial, converting the harmful corrosive environment into a beneficial protective mechanism. The salt fog that would normally corrode the iron core instead reacts with the zinc alloy layer, which corrodes preferentially and protects the iron core, effectively using the harmful environment to protect the core.
Solution Approach 2:
The chemical composition of the protective layer is changed from carbon-based (oil) or thick metal plating to a specific zinc alloy composition that provides optimal balance between corrosion protection and dimensional stability. The zinc alloy's electrochemical properties are utilized to provide cathodic protection while maintaining geometric precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The metal rod provides cathodic protection, reducing corrosion of the silicon steel sheets without increasing the air gap, thus maintaining the retention force of the contactor in salt fog environments.
Implementation Method 1
a material of the metal rod is one or more selected from the group consisting of aluminum, aluminum alloy, magnesium, magnesium alloy, zinc and zinc alloy
Data Source
AI summary
An iron core for a contactor and a contactor. The iron core includes an iron core body, the iron core body includes a plurality of silicon steel sheets fixed together by lamination, the iron core body further includes a metal rod, the metal rod penetrates and is fixed to at least some of the plurality of silicon steel sheets, and a material of the metal rod is one or more selected from the group consisting of aluminum, aluminum alloy, magnesium, magnesium alloy, zinc and zinc alloy.