Electrochemical Boronizing of Downhole Tools
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Solution Overview
Problem
Conventional boronizing methods for downhole tools and components are costly, time-consuming, and expose materials to high temperatures, leading to undesirable degradation and dimensional issues, limiting their effectiveness in aggressive wellbore environments.
Innovation Solution
A method involving electrochemical boronizing using a molten electrolyte with a boron oxide content between 5-50 weight percent and other materials like hydroxides or carbonates, applied at temperatures below 700°C to diffuse boron atoms into metal surfaces, forming metal borides without altering the component's shape or dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional boronizing methods (powder pack, gas, fluidized bed, plasma, molten salt) are used, then boron diffusion into metal surfaces is achieved, but processing time becomes excessively long (6-25 hours) and temperatures become unacceptably high (altering component shape and dimensions)
Solution Approach 1:
The patent changes the fundamental parameters of the boronizing process by using an ionic liquid electrolyte containing boron compounds combined with electrochemical methods. This allows boron diffusion at significantly lower temperatures (below 700°C) and reduces processing time from 6-25 hours to a fraction of that time, while still achieving effective boron penetration and formation of metal borides for enhanced material resistance.
Solution Approach 2:
The patent replaces conventional thermal diffusion mechanisms with electrochemical boronizing. By applying electrical current to the metal component immersed in the ionic liquid electrolyte, boron ions are directly transported and deposited onto the metal surface through electrochemical reactions, eliminating the need for prolonged high-temperature thermal treatment.
2Reliability
If conventional boronizing methods are used, then boron diffusion into metal surfaces is achieved, but component shape and dimensions are altered due to high temperatures causing warping and exceeding engineering tolerances
Solution Approach 1:
The patent fundamentally changes the temperature parameter from conventional high-temperature processes to low-temperature electrochemical processing below 700°C. This temperature reduction prevents thermal warping and dimensional changes while still achieving effective boron diffusion through electrochemical mechanisms, thereby maintaining manufacturing precision and engineering tolerances.
3Reliability
If conventional boronizing methods are used, then boron diffusion into metal surfaces is achieved, but processing costs become prohibitive
Solution Approach 1:
The patent replaces complex, time-consuming conventional boronizing equipment and processes with a simpler electrochemical cell setup using ionic liquid electrolyte. This substitution reduces equipment complexity, energy consumption, and processing time, thereby significantly lowering manufacturing costs while maintaining effective boron diffusion and material enhancement.
4Reliability
If conventional boronizing methods are used, then boron diffusion into metal surfaces is achieved, but high temperatures cause undesirable degradation of materials present in or on the component
Solution Approach 1:
The patent changes the temperature parameter from high to low (below 700°C) and uses electrochemical mechanisms instead of thermal diffusion. This prevents thermal degradation of sensitive materials, coatings, or polymers that may be present on or in the component, while still achieving effective boron diffusion through the ionic liquid electrolyte and electrochemical reactions.
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 enables fast, cost-effective, and efficient boronization of downhole components, enhancing their thermal resistance, hardness, and chemical resistance while maintaining their original dimensions and properties, thus improving their performance in harsh downhole conditions.
Implementation Method 1
diffuse boron atoms from the molten electrolyte into a surface of the at least a portion of the metal
Implementation Method 2
applying electrical current to the at least a portion of the metal while maintaining a temperature of the molten electrolyte below about 700° C.
Data Source
AI summary
A method of boriding a metal comprises forming a molten electrolyte comprising between about five weight percent and about fifty weight percent boron oxide, and contacting at least a portion of a metal with the molten electrolyte. Electrical current is applied to at least a portion of the metal while maintaining a temperature of the molten electrolyte below about 700° C. to diffuse boron atoms from the molten electrolyte into a surface of the at least a portion of the metal. A downhole tool including at least one borided component is also disclosed.