Shot Dose Tin Corrosion Inhibitor for Water Systems
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Solution Overview
Problem
Conventional corrosion inhibition methods in water systems require continuous application of inhibitors, leading to high costs, environmental concerns, and inefficiencies, particularly with Tin-based compounds that struggle to maintain an effective protective film due to oxidation and precipitation issues.
Innovation Solution
A method involving a 'shot dose' of a Tin(II) corrosion inhibitor to form a stable and persistent Tin(IV) film on metal surfaces, followed by intermittent service doses, reducing the overall inhibitor requirement and extending protection without continuous treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous treatment of corrosion inhibitors is applied, then corrosion protection is maintained, but cost and environmental impact increase
Solution Approach 1:
The patent applies periodic shot dosing of corrosion inhibitors instead of continuous treatment. The inhibitor is applied in intermittent pulses at controlled intervals, allowing the formation of protective films that persist between doses. This periodic application maintains corrosion protection while significantly reducing overall inhibitor consumption compared to continuous dosing methods.
Solution Approach 2:
The shot dose methodology applies a preliminary concentrated dose of corrosion inhibitor that forms a protective film in advance before corrosion can occur. This preliminary film formation creates a reservoir of protection that persists over time, eliminating the need for continuous inhibitor application and reducing total consumption.
2Reliability
If continuous treatment of corrosion inhibitors is applied, then corrosion protection is maintained, but environmental impact and effluent toxicity increase
Solution Approach 1:
By applying inhibitors periodically rather than continuously, the effluent stream contains inhibitor residues only during and shortly after dosing events, rather than maintaining constant toxic levels. This reduces the overall environmental burden and simplifies effluent treatment requirements.
3Reliability
If Tin(II) corrosion inhibitor is continuously applied, then protection is maintained, but oxidation to Tin(IV) and precipitation reduce effectiveness
Solution Approach 1:
The periodic shot dosing methodology delivers concentrated pulses of Tin(II) inhibitor that rapidly form protective films before significant oxidation can occur. The intermittent application allows the inhibitor to act on fresh metal surfaces where it forms stable films, rather than continuously dosing into systems where oxidation and precipitation continuously consume the inhibitor.
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 significantly reduces the amount of corrosion inhibitor needed, lowers costs, minimizes environmental impact, and maintains effective corrosion protection for longer periods with reduced consumption and oxidation losses, while being more tolerant of overdosing and compatible with effluent reuse.
Implementation Method 1
the mechanism by which the stannous salts inhibited corrosion was not well understood. Previous corrosion inhibition programs utilized the stannous salts in much the same manner as conventional corrosion inhibitors in which a maintenance dose of the stannous inhibitors were introduced into the aqueous systems to continuously maintain a minimum stannous concentration in order to be effective.
Data Source
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AI summary
There are provided methods of suppressing corrosion of a corrodible metal surface that contacts a water stream in a water system, the method comprising: (a) introducing into the water stream a shot dose of a treatment composition comprising a corrosion inhibitor, the shot dose being introduced into the water stream over a first time period and the water stream having a first concentration of corrosion inhibitor during the first time period; (b) then reducing the amount of treatment composition that is introduced into the water stream; and (c) after the first time period, maintaining a second concentration of corrosion inhibitor in the water stream over a second time period, the second concentration being less than 25 % of the concentration of corrosion inhibitor during the first time period. There is also provided, after the second time period, introducing into the water stream a second shot dose of the corrosion inhibitor, the second shot dose being introduced into the water stream over a third time period, the third concentration being greater than the second concentration.