Water System Corrosion Passivator Composition With Hydroxycarboxylic Acid
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Solution Overview
Problem
Conventional corrosion inhibitors, such as phosphates and zinc-based treatments, face challenges in forming robust films, lead to environmental concerns, and are limited by regulatory discharge requirements, while tin-based inhibitors struggle with maintaining effective concentrations and efficiency.
Innovation Solution
A synergistic combination of multi-valent metal salts, particularly tin and aluminum, with hydroxycarboxylic acids forms a tenacious protective film on metal surfaces, reducing the need for high concentrations and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphate and zinc-based corrosion inhibitors are used to form protective films on metal surfaces, then corrosion protection is improved, but environmental harm increases and regulatory compliance becomes difficult
Solution Approach 1:
The patent changes the chemical composition parameters by replacing phosphate and zinc-based inhibitors with alternative chemistries that provide equivalent corrosion protection without the harmful environmental effects. This involves adjusting inhibitor concentrations, pH levels, and chemical formulations to achieve the same protective film formation on metal surfaces while eliminating phosphorus and zinc discharge into the environment.
Solution Approach 2:
The patent employs readily available alternative corrosion inhibitor chemicals that can be continuously dosed at low concentrations to maintain protection, replacing the need for persistent phosphate and zinc chemicals that accumulate in the environment and require costly disposal and treatment to meet regulatory limits.
2Reliability
If zinc and phosphate are applied at levels required to form robust passive films, then corrosion inhibition is improved, but heat transfer surface fouling increases
Solution Approach 1:
The patent changes the chemical parameters by using alternative inhibitor chemistries that form protective films at lower concentrations, preventing both corrosion and fouling. The formulation adjusts pH, inhibitor type, and concentration to achieve robust passivation without the precipitation and fouling issues associated with high-level zinc and phosphate application.
3Reliability
If conventional corrosion inhibitors are used to protect metal surfaces, then corrosion control is achieved, but discharge regulations compliance becomes difficult
Solution Approach 1:
The patent fundamentally changes the chemical composition parameters by eliminating phosphorus and zinc from the corrosion inhibitor formulation. This allows the system to maintain effective corrosion control while discharging into the environment without exceeding regulatory limits for these harmful substances, thereby achieving compliance with environmental discharge regulations.
4Reliability
If tin-based corrosion inhibitors are used to form protective films, then corrosion protection is improved, but maintaining effective Tin(II) concentration over time becomes difficult due to oxidation and precipitation
Solution Approach 1:
The patent employs a self-regulating chemical system where the alternative inhibitor formulation automatically maintains its effectiveness over time through inherent chemical stability. The system self-corrects for oxidation and precipitation issues by using chemically stable compounds that do not undergo the same degradation pathways as Tin(II), eliminating the need for continuous monitoring and adjustment to maintain protective film formation.
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 method achieves superior corrosion inhibition with significantly lower amounts of inhibitors, maintaining effectiveness over time and reducing environmental impact, while being compliant with stringent discharge regulations.
Implementation Method 1
forming a tenacious protective film on metal surfaces
Implementation Method 2
synergistic combination of passivators, such as salts of multi-valent metals, and hydroxycarboxylic acids
Implementation Method 3
shifting the electrochemical corrosion potential of the corroding metal in the positive direction indicating the retardation of the anodic process (anodic control)
Implementation Method 4
displacement in the negative direction indicating mainly retardation of the cathodic process (cathodic control)
Data Source
AI summary
Methods and compositions for suppressing corrosion of a corrodible metal surface that contacts a water stream in a water system. The method comprises introducing into the water stream a treatment composition, the treatment composition including a combination of passivators and a hydroxycarboxylic acid promoter.