Hybrid Parylene-Metal Oxide Coatings for Corrosion Resistance

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Solution Overview

Problem

Existing electronic device coatings lack comprehensive protection against corrosive chemical species, mechanical wear, and electromagnetic interference, leading to potential failure in harsh environments.

Innovation Solution

A composite coating comprising a parylene layer with a metal oxide hybrid layer, where the metal oxide precursor diffuses into the parylene layer and oxidizes, forming a metal oxide layer on the surface and within the parylene layer, enhancing corrosion resistance, mechanical durability, and electromagnetic properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a thin film protective coating is applied to electronic components, then protection from corrosive chemical species is provided, but comprehensive protection against mechanical wear and electromagnetic interference is insufficient

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidcomprehensive protection capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies composite materials by combining parylene polymer matrix with metal oxide nanoparticles (such as aluminum oxide, titanium oxide, zinc oxide) to create a hybrid coating system. This composite structure provides comprehensive protection against corrosion, mechanical wear, and electromagnetic interference simultaneously, resolving the limitation of single-material coatings that can only provide partial protection.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent implements local quality by incorporating metal oxide nanoparticles specifically at the coating-substrate interface and within the polymer matrix. This localized enhancement provides targeted improvement in mechanical adhesion, wear resistance, and electromagnetic shielding properties without compromising the overall coating integrity or optical properties.

Inventive Principle:

Principle #3Local quality

2Reliability

If protective cases or enclosures are used to limit exposure to water and corrosive species, then corrosion protection is improved, but volume and mass of the electronic product increase

Engineering Contradiction:

Improvecorrosion protectionVSAvoidproduct mass

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent employs thin film composite coatings that conformally coat electronic components and circuit boards. These ultra-thin protective layers provide comprehensive environmental protection without adding significant mass or volume, replacing bulky protective enclosures with lightweight nanoscale coatings.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The composite structure of parylene polymer combined with metal oxide nanoparticles creates a high-performance protective coating that achieves protection levels previously requiring thick enclosures, but with minimal added weight due to the nanoscale thickness of the coating layer.

Inventive Principle:

Principle #40Composite materials

3Reliability

If existing corrosion-resistant coatings are applied to electronic components, then resistance to corrosive chemicals is provided, but resistance to mechanical handling and wear is insufficient

Engineering Contradiction:

Improvechemical resistanceVSAvoidmechanical wear resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent creates a composite coating where metal oxide nanoparticles (aluminum oxide, titanium oxide, zinc oxide) are dispersed within the parylene polymer matrix. These nanoparticles significantly enhance mechanical wear resistance, scratch resistance, and hardness while maintaining the chemical inertness and corrosion resistance of the polymer base material.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The metal oxide nanoparticles are strategically positioned within the coating structure, with higher concentration at the surface and coating-substrate interface, providing localized enhancement of mechanical properties where wear and handling stresses are most severe, while preserving chemical resistance throughout the coating.

Inventive Principle:

Principle #3Local quality

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 composite coating significantly improves resistance to corrosive chemicals, mechanical wear, and electromagnetic interference, while maintaining optical properties and reducing permeation of harmful substances, thus extending the lifespan of electronic components.

Implementation Method 1

a metal oxide precursor is applied to a surface of the parylene layer. The metal oxide precursor is infused into the parylene layer

Methodology Applied

Scientific EffectDiffusion: Diffusion

Implementation Method 2

The metal oxide precursor is infused into the parylene layer and oxidized to form a metal oxide layer covering the parylene layer and a metal oxide, parylene hybrid layer within the parylene layer

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS10553512B2Hybrid parylene-metal oxide layers for corrosion resistant coatings

Publication Date: 2020.02.04 HZO INC

AI summary

Described herein is a composite coating on a substrate including a parylene layer deposited on a substrate surface of a substrate, a metal oxide layer covering the parylene layer, and a metal oxide, parylene hybrid layer formed between the metal oxide layer and the parylene layer.