Electro-Plasma Cleaning Using Dense Foam for Metal Surfaces
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Solution Overview
Problem
Conventional electrolytic cleaning and coating processes are inefficient in removing mill oxide scales and contaminants from metal surfaces, requiring high energy consumption and often necessitating multi-stage operations, while also being environmentally unfriendly.
Innovation Solution
The process employs a continuous-circulation electro-plasma technology that operates in a regime where voltage increase corresponds with amperage increase, utilizing a dense foam to enhance plasma formation and stability, allowing for efficient cleaning and coating with reduced energy consumption and the ability to process multiple workpieces inline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic cleaning processes are used to remove mill oxide scales, then cleaning capability is improved, but energy consumption increases and environmental harm worsens
Solution Approach 1:
The patent changes the electrical operating parameters from conventional low-voltage (3-25V) electrolytic cleaning to high-voltage (50-500V) electro-plasma cleaning. This parameter change enables the process to operate in the plasma discharge region rather than the unstable region, achieving effective oxide scale removal with lower energy consumption and without environmental harm from chemical waste
Solution Approach 2:
The patent utilizes the phase transition from conventional electrolytic cleaning to electro-plasma cleaning by operating in the plasma discharge region. The high voltage causes breakdown of the vapor inside bubbles, transitioning from simple electrolysis to plasma discharge, which provides superior cleaning capability with reduced energy consumption and environmental impact
2Stability of the object's composition
If conventional electrolytic processes operate in low-voltage regime, then process stability is improved, but cleaning effectiveness deteriorates
Solution Approach 1:
The patent shifts the operating voltage from low-voltage (3-25V) to high-voltage (50-500V) regime, changing the electrical characteristics from conventional electrolytic cleaning to electro-plasma cleaning. This parameter change enables effective removal of tenacious oxide scales while maintaining process stability through controlled plasma discharge in the stable region
3Reliability
If high voltage is applied in conventional electrolytic processes, then cleaning power is improved, but process stability deteriorates due to arc discharge
Solution Approach 1:
The patent introduces a foaming electrolyte as an intermediary medium between the high voltage power source and the workpiece surface. The foam structure distributes the high voltage discharge uniformly across the surface, preventing localized arc discharge and maintaining process stability while providing powerful cleaning action
Solution Approach 2:
The patent replaces the conventional liquid electrolyte system with a foaming electrolyte system. The foam structure provides a stable, distributed discharge medium that substitutes for the unstable liquid-to-gas transition in conventional high-voltage electrolytic processes, enabling stable operation at high voltages
4Device complexity
If conventional electrolytic processes are used, then process simplicity is improved, but productivity deteriorates due to multi-stage operations
Solution Approach 1:
The electro-plasma cleaning process performs multiple functions in a single operation: it removes mill oxide scales, cleans organic contaminants, and activates the metal surface for coating adhesion. This multi-functionality eliminates the need for separate cleaning and activation stages, improving productivity while maintaining process simplicity
Solution Approach 2:
The patent merges the cleaning function and surface activation function into a single electro-plasma process step. Conventional processes require separate electrolytic cleaning followed by separate activation treatment, but the electro-plasma process achieves both objectives simultaneously through controlled plasma discharge
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 achieves effective removal of mill oxide scales and contaminants with lower energy consumption, improved coating uniformity, and the potential to eliminate the need for environmentally harmful chemicals, while enabling the reuse of waste materials as commercial products.
Implementation Method 1
electro-plasma technology
Implementation Method 2
generation of hydrogen plasma within the gas envelope
Implementation Method 3
intensive electrolysis of the solution and liberation of Joule heat
Implementation Method 4
liberation of Joule heat
Implementation Method 5
metal atoms are transferred from the anode to the cathode, providing a metal coating on the cleaned surface
Data Source
AI summary
An improved process for treating an electrically conductive surface of a workpiece by cleaning or coating the surface is provided, comprising the steps of deploying the electrically conducting surface of the workpiece to form a cathode in an electrolytic cell; establishing a DC voltage between the cathode and an anode; forming a working gap between the anode and the cathode, and establishing a seal around the working gap to form a sealed treatment zone; delivering into the working gap an electrically conductive medium selected from the group consisting of: (A) an aqueous electrolyte from which a foam is created; (B) a foam; and a mixture of components (A) and (B), so that electrically conductive medium consisting of a foam comprising a gas/vapor phase and a liquid phase fills the working gap, wherein said electrically conductive medium enters the electrolytic cell through tubes having discharge ends oriented at approximately ten degrees from parallel to the workpiece, and wherein turbulence is created within the electrolytic cell; adjusting the operating parameters so that an electro-plasma discharge is created between the cathode and positive ions in the electrically conductive medium which are concentrated near the electrically conducting surface of the workpiece, thereby causing micro-zonal melting of the surface; and removing foam from the working gap.