Insulating Coating Dimensions for Propagating Brush Discharge Prevention
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Solution Overview
Problem
The application of insulating coatings on conductive materials can lead to spontaneous electrical surface discharges, known as propagating brush discharges, which are undesirable, especially when these coatings are used on electrically-grounded components, as they can cause galvanic corrosion and other issues.
Innovation Solution
The method involves determining and applying insulating coating sections in dimensioned areas to prevent electrical surface discharges while maintaining galvanic protection, by testing specimens for propagating brush discharges and adjusting the coating dimensions, such as surface area and thickness, to ensure effective charge dissipation and prevent galvanic corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating coating is applied to conductive materials to prevent galvanic corrosion, then galvanic corrosion protection is improved, but electrical surface discharges (propagating brush discharges) occur
Solution Approach 1:
The insulating coating is divided into discrete sections rather than applying a continuous coating. These segmented insulating coating sections are spaced apart to expose bare conductive sections that allow charge dissipation, preventing propagating brush discharges while maintaining galvanic corrosion protection at the coated interfaces.
Solution Approach 2:
Different sections of the conductive material have different coating configurations. The insulating coating sections provide galvanic protection where needed, while the exposed bare conductive sections provide charge dissipation pathways. This local differentiation resolves the contradiction between corrosion protection and discharge prevention.
2Reliability
If insulating coating surface area is increased to enhance galvanic protection, then corrosion protection is improved, but charge dissipation capability deteriorates
Solution Approach 1:
The coating is segmented into discrete sections with controlled spacing. This segmentation allows optimization of the balance between coated surface area for corrosion protection and exposed bare sections for charge dissipation. The segmented structure enables charge to leak through multiple discrete pathways rather than requiring large continuous exposed areas.
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
This approach effectively reduces or eliminates electrical surface discharges and prevents galvanic corrosion between conductive components, allowing for maximum insulating coating application without compromising protective functions.
Implementation Method 1
The application of thin insulating coatings onto conductive materials is common in a variety of industries. In some instances, these insulating coatings may be purposefully applied to mitigate or prevent the corrosive degradation of the conductive materials. For example, insulating coatings may mitigate or prevent galvanic corrosion of metallic aircraft components by preventing charge mobility between components.
Implementation Method 2
Capacitance may result in spontaneous, self-initiated electrical surface discharges when the electrostatic charges cannot relax to ground. These spontaneous, self-initiated electrical surface discharges are also commonly known as propagating brush discharges (PBD).
Data Source
AI summary
Systems and methods for determining the dimensions of insulating coating sections applied to a conductive component are disclosed. The method includes providing a specimen having an insulating coating section of a first surface area and a first thickness. The method further includes conducting a test of the specimen for propagating brush discharges. If the specimen exhibits propagating brush discharges, the method further includes reducing at least one of the first surface area and the first thickness to produce at least one of a second surface area or a second thickness, or reducing a first maximum distance that any portion of the insulating coating may extend from an adjacent static dissipative feature to produced a second maximum distance. In additional embodiments, insulating coating patterns may be established on the component based on at least one of the dimensions of the second surface area, the second thickness, or the second maximum distance.