Silicon Coating for Chromium-Free Metal Corrosion Resistance

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Solution Overview

Problem

Conventional protective coatings for chromium-free metal components, such as chromate coatings and hard chrome plating, pose environmental and health risks, while organic coatings deteriorate at high temperatures, leading to corrosion and chemical attacks on metal substrates.

Innovation Solution

A substantially chromium-free, silicon-containing fluid composition layer is applied to metal components and heated above 400°F to form a protective coating that provides corrosion and sulfidation resistance, retaining effectiveness at elevated temperatures and eliminating the risks associated with traditional coatings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chromate coatings are applied to prevent white rust defects, then corrosion resistance is improved, but environmental and health risks increase

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidenvironmental and health risks

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the protective coating by using silicon-containing fluids instead of chromate coatings. The silicon-containing fluid forms a protective coating through heating that provides corrosion resistance without the harmful chromium compounds, thus maintaining reliability while eliminating environmental and health risks

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces expensive and hazardous chromate coatings with a more economical silicon-containing fluid that can be applied and cured through heating. The silicon-containing coating provides equivalent protection without the need for complex safety infrastructure and disposal procedures associated with chromate coatings

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If hard chrome plating is applied to reduce friction and wear, then durability is improved, but chemical hazards and environmental damage increase

Engineering Contradiction:

ImprovedurabilityVSAvoidchemical hazards

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent changes the material composition from chromium-based plating to silicon-containing coating. The silicon-containing fluid forms a protective layer through heating that provides durability and wear resistance without the extremely hazardous chemicals involved in electrolytic deposition processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the electrolytic deposition process with a thermal conversion process. Instead of using electrical current to deposit chromium, the silicon-containing fluid is applied and then heated to convert it into a protective coating, eliminating the need for hazardous electrolytes and electrical infrastructure

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If organic coatings are applied to protect metal substrates, then corrosion resistance is improved, but heat resistance deteriorates

Engineering Contradiction:

Improvecorrosion resistanceVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the chemical composition of the coating from organic polymer-based to inorganic silicon-containing coating. The silicon-containing fluid forms a coating that maintains its protective properties at elevated temperatures because it lacks the polymer binder that causes organic coatings to deteriorate heat

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite protective coating system where silicon-containing fluid forms an inorganic protective layer that combines with the metal substrate. This composite structure provides both corrosion resistance and heat resistance, overcoming the limitation of organic coatings that can only protect at low temperatures

Inventive Principle:

Principle #40Composite materials

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 silicon-containing protective coating effectively masks and protects metal substrates at room and elevated temperatures, reducing corrosion and sulfidation, and can be applied to metals like copper tubing, eliminating the need for alloying for corrosion resistance and avoiding hazardous coating processes.

Implementation Method 1

a substantially chromium-free fluid composition layer containing silicon is applied to the substantially chromium-free metal component and heated to a temperature exceeding 400° F. to convert the composition layer to the substantially chromium-free protective coating

Methodology Applied

Scientific EffectThermal conversion:

Implementation Method 2

The protective coating may be, for example, effective for reducing corrosion and sulfidation of the underlying metal of the metal component

Methodology Applied

Scientific EffectCorrosion resistance:

Data Source

PatentUS8623461B2Metal components with silicon-containing protective coatings substantially free of chromium and methods of forming such protective coatings

Publication Date: 2014.01.07 AEROMET TECHNOLOGIES INC

AI summary

A metal component (10) with a protective coating (16) containing silicon and a process for forming such protective coatings (14). The protective coating (16) is formed by applying a silicon-containing fluid composition to the metal component (10) as a silicon-containing layer (12) and heating the silicon-containing layer (12) to a temperature exceeding 400° F.