Polymer Mold Replica for 3D Corrosion Cavity Characterization
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Solution Overview
Problem
Current methods for characterizing pitting corrosion in metallic materials are limited in their ability to accurately determine the three-dimensional morphology of micro and nano-cavities, true length of corrosion, and corrosion rate, particularly in the oil and gas industry, where existing techniques like ultrasound and laser methods have depth limitations and are costly and time-consuming.
Innovation Solution
A procedure involving a polymer mold created using a Constant-Volume Injection Chamber (CIVC) to acquire a three-dimensional replica of corrosion cavities, combined with SEM techniques and volumetric and gravimetric formulations, allows for the determination of the shape, dimensions, and distribution of cavities, as well as the effective advance of corrosion, enabling precise characterization of micro and nano-cavities caused by chemical and microbiological corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasound and laser methods are used to characterize pitting corrosion, then measurement capability is provided, but depth limitations and high cost occur
Solution Approach 1:
The patent creates a polymer mold copy of the corrosion cavity instead of directly measuring the metal surface. The polymer replica captures the three-dimensional morphology of the pit, allowing detailed characterization without the depth limitations of ultrasound/laser methods and at lower cost.
Solution Approach 2:
The polymer mold acts as an intermediary between the corrosion cavity and the measurement system. By transferring the cavity geometry into a accessible polymer replica, the method enables precise measurement of deep cavities that would be difficult to reach with conventional ultrasound or laser techniques.
2Measurement precision
If conventional corrosion measurement techniques are used, then corrosion rate can be determined, but three-dimensional morphology and true length of corrosion cannot be accurately determined
Solution Approach 1:
The patent transitions from two-dimensional surface measurements to three-dimensional volume characterization by creating a polymer mold that captures the full geometry of the corrosion cavity. This allows determination of true length, volume, and shape parameters that conventional methods cannot obtain.
Solution Approach 2:
The polymer replica serves as a three-dimensional copy of the corrosion cavity, preserving all geometric information including depth, width, and shape. This copy can be measured and analyzed to obtain complete morphological data without destroying the original metal specimen.
3Productivity
If existing corrosion analysis methods are used, then basic corrosion characterization is possible, but detailed three-dimensional morphology and quantitative corrosion growth rate are limited
Solution Approach 1:
By creating a polymer mold copy, the method enables parallel processing of multiple specimens simultaneously. The polymer replicas can be prepared and measured in parallel, increasing productivity while maintaining high precision through accurate three-dimensional capture of cavity morphology.
Solution Approach 2:
The patent replaces complex mechanical measurement systems (ultrasound, laser) with a simpler polymer molding process followed by optical microscopy. This substitution maintains or improves measurement precision while enhancing productivity through easier sample preparation and analysis.
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 provides a more precise, economic, and rapid method for determining the corrosion rate and morphology, surpassing existing technologies by enabling detailed three-dimensional characterization of corrosion cavities and accurate quantification of corrosion advance, facilitating better understanding and mitigation of corrosion in metallic materials.
Implementation Method 1
a polymer mold created using a Constant-Volume Injection Chamber (CIVC) to acquire a three-dimensional replica of corrosion cavities
Implementation Method 2
combined with SEM techniques and volumetric and gravimetric formulations, allows for the determination of the shape, dimensions, and distribution of cavities
Data Source
AI summary
The present invention refers to a procedure which includes the following objectives:a) To determine the morphology of the micro and nanocavities produced by chemical and/or microbiological corrosion in metallic materials, in the space of three dimensions as well as the effective advance of corrosion, the true length of corrosion cavities and their associated parameters: corrosion vectors, corrosion intensity and determination of the cavities diameter/true length of corrosion ratio, applying scanning electron microscopy (MEB) techniques, and analytic, gravimetric and volumetric formulations;b) To quantitatively determine the rate of chemical and/or microbiological corrosion in metallic materials, through their volumetric and gravimetric properties; andc) To obtain a graphic interface to access the numeric information and the micrographs in a simple and friendly manner.More specifically, the present invention is related to the laboratory procedures, analytic expressions, devices, procedures and calculations required to characterize the micro and nanocavities of coupons and biocoupons, caused by chemical and/or microbiological pitting and uniform corrosion.