Electrolytic Corrosion Test Standards for NDT Calibration

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Solution Overview

Problem

Traditional nondestructive testing (NDT) methods face challenges in detecting corrosion on painted or coated substrates, as corrosion often becomes evident only when it disrupts the paint, requiring paint removal and resulting in significant downtime and hazardous waste generation, and existing methods are subjective and unreliable.

Innovation Solution

A process to create NDT corrosion test standards by creating substrates with known corrosion defects, masking areas to limit corrosion, using electrolytic processes in seawater baths, and simulating environmental stresses to develop standards that can be used for calibration and evaluation of NDT methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional NDT methods are used to detect corrosion on painted substrates, then corrosion can be detected, but the paint must be removed which causes significant downtime and generates hazardous waste

Engineering Contradiction:

Improvecorrosion detection reliabilityVSAvoiddowntime for paint removal and replacement

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent creates test standards with pre-established corrosion defects before painting the substrates. This preliminary creation of known defects allows NDT systems to be calibrated and validated without requiring actual corrosion to develop, eliminating the need for paint removal and replacement while maintaining detection reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates artificial copies of corrosion defects (such as cavities, pits, and cracks) embedded in substrates before painting. These copied defects serve as benchmarks for NDT system calibration, allowing reliable detection validation without actual corrosion progression that would require paint removal

Inventive Principle:

Principle #26Copying

2Reliability

If traditional NDT methods are used to detect corrosion on painted substrates, then corrosion can be detected, but the method is subjective and unreliable

Engineering Contradiction:

Improvecorrosion detection reliabilityVSAvoidcorrosion detection precision

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent replaces subjective mechanical inspection methods (such as hammering and listening) with objective NDT systems calibrated against known defects. The mechanical substitution eliminates human subjectivity by using instrumented detection methods with quantifiable measurements against established benchmarks

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent transforms the detection process from subjective qualitative assessment to objective quantitative measurement by calibrating NDT systems against test standards with known defect parameters (size, depth, location). This parameter-based calibration enables precise and repeatable measurements

Inventive Principle:

Principle #35Parameter changes

3Reliability

If paint is removed to detect corrosion, then corrosion can be identified, but significant hazardous waste is generated

Engineering Contradiction:

Improvecorrosion identification reliabilityVSAvoidhazardous waste from paint removal

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent performs preliminary creation of corrosion defects and calibration of NDT systems before any actual inspection is needed. This advance preparation eliminates the need for paint removal during routine inspections, preventing hazardous waste generation while maintaining reliable corrosion identification

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the previously harmful practice of paint removal into a benefit by replacing it with non-destructive calibration and inspection methods. The hazardous waste generation is eliminated entirely while corrosion identification reliability is maintained through objective NDT system calibration

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enables reliable and reproducible detection of corrosion damage under paint, distinguishing it from mechanical defects, reducing downtime and hazardous waste, and providing a benchmark for NDT system calibration.

Implementation Method 1

using the un masked substrate surface areas as an anode for the application of current; this creates corrosion defects in the areas not covered by masking

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Implementation Method 2

masking the substrate with a substance that will limit corrosion to one or more selected areas during accelerated corrosion of the substrate

Methodology Applied

Scientific EffectPhysical barrier protection: Physical Containment

Data Source

PatentUS8448490B2Processes to create discrete corrosion defects on substrates and establish corrosion NDI test standards

Publication Date: 2013.05.28 CONCURRENT TECHNOLOGIES CORP

AI summary

Methods and apparatuses are provided for creation of discrete corrosion defects with a wide range of diameter to depth aspect ratios for painted test standards. Also provided are methods for use of those test standards to characterize the corrosion under paint detection threshold, statistical reliability, and accuracy of NDI and/or NDT techniques including but not limited to flash thermography, ultrasonic testing, eddy current testing, microwave testing, shearography, and infrared testing.