CVD Corrosion Inhibiting Layer for Copper

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Solution Overview

Problem

Copper corrosion poses a significant threat to device reliability in industrial applications, particularly in microelectronic and high-power transmission lines, due to its susceptibility to aggressive environments, and existing corrosion inhibition methods are limited by reversibility, carrier medium effects, and inability to withstand high temperature and variable corrosive conditions.

Innovation Solution

Chemical vapor deposition (CVD) techniques are used to apply a corrosion-inhibiting layer on copper surfaces, selecting appropriate inhibitor compounds and controlling operational parameters to form a stable, uniform, and thermally stable coating that can withstand harsh environments, with the option to recycle unused inhibitor compounds for cost-effectiveness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If volatile corrosion inhibitor compounds are used in vapor phase to promote corrosion protection, then corrosion protection is achieved, but the application is limited to closed space applications and requires carrier mediums that can themselves cause corrosive effects

Engineering Contradiction:

Improvecorrosion protectionVSAvoidapplication environment flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent extracts and eliminates the carrier medium requirement from the VCI application system. By using direct vapor phase deposition of inhibitor compounds onto the metal surface without requiring carrier materials like glycols or wax, the invention removes the source of carrier-induced corrosion while maintaining protection effectiveness in both closed and open environments.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention creates a universal corrosion protection method that works across multiple environment types (closed spaces, open environments, high temperature areas) without requiring different carrier mediums or application conditions. The vapor phase inhibitor deposition provides consistent protection regardless of the specific environmental conditions.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If inhibitor compounds are added to solution for corrosion protection, then corrosion inhibition is achieved, but the coating may not be strong enough to survive high temperature and high bias corrosive environments

Engineering Contradiction:

Improvecorrosion inhibitionVSAvoidthermal stability

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent replaces liquid solution-based coating application with vapor phase deposition. This substitution eliminates the weakness of solution coatings that cannot withstand high temperatures, as the vapor-deposited inhibitor compounds form a more robust, thermally stable coating that maintains integrity at elevated temperatures and under high bias corrosive conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If VCI compounds are used in vapor phase with carrier mediums, then corrosion protection is provided, but the reversibility of inhibitor adsorption limits usefulness to closed space applications

Engineering Contradiction:

Improvecorrosion protectionVSAvoidprotection durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention changes the fundamental parameter of inhibitor application from adsorption-based (reversible) to deposition-based (irreversible). By depositing inhibitor compounds directly onto the metal surface in vapor phase, the coating forms a permanent, non-reversible layer that provides durable, long-lasting corrosion protection beyond the limitations of reversible adsorption.

Inventive Principle:

Principle #35Parameter changes

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 CVD process provides a scalable, reproducible, and environmentally stable corrosion inhibition solution that significantly enhances copper's resistance to corrosion, maintaining effectiveness at high temperatures and in diverse corrosive conditions, while reducing material waste and costs through recycling.

Implementation Method 1

chemical vapor deposition (CVD) techniques may be used to apply corrosion inhibiting layers

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS20210071308A1Selective surface finishing for corrosion inhibition via chemical vapor deposition

Publication Date: 2021.03.11 UNIVERSITY OF NORTH TEXAS

AI summary

A versatile, thermally stable and economically effective corrosion inhibition treatment for copper (Cu) metal and selected metals surface through a single step chemical vapor deposition (CVD) of selected inhibitor compounds at temperatures as low as 100-200° C. is described in this invention. The resulting CVD deposited inhibition coating is thermally stable to 300° C. and protects Cu and selected metals from active corrosion in various technologically important operational environments. The selective coating for copper metal is achieved by controlling the chemistry of bonding between the Copper metal surface and inhibitor material used. The technique can be accomplished by using one or more inhibitors separately or in combination in order to create an all-terrain stable & robust corrosion prevention coating for copper metal.