Modulated Current Density Zinc Alloy Coating for Corrosion Protection
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Solution Overview
Problem
Current methods for forming multilayered zinc alloy coatings are complex and expensive, using specialized equipment, and result in non-continuous deposition processes with lower efficiency, limiting their industrial application and corrosion protection effectiveness.
Innovation Solution
A method involving a modulated direct current deposition process using standard electroplating equipment, where current density is alternated between two values to create layers with varying proportions, corrosion potential, and grain orientation, allowing for the formation of a multilayered zinc alloy coating with improved corrosion protection using zinc and a second electrodepositable component like nickel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse plating is used to create laminar structures, then corrosion protection is improved, but device complexity and process cost increase due to specialized equipment requirements
Solution Approach 1:
The patent applies parameter changes by modulating the current density between two distinct values (first current density value and second current density value) during the electroplating process. This parameter modulation creates alternating layers with different properties (different proportions of second component, different corrosion potentials, different grain sizes) without requiring complex specialized pulse plating equipment, thus resolving the contradiction between improved corrosion protection and reduced device complexity
Solution Approach 2:
The patent implements periodic action through cyclic modulation of current density over time. The current density alternates between the first value and second value in repeated cycles, producing a multilayered structure with alternating properties. This periodic modulation achieves the laminar structure benefits for corrosion protection while using standard electroplating equipment, avoiding the need for complex specialized pulse plating systems
2Reliability
If pulse plating is used to form multilayered structures, then corrosion protection is improved, but productivity decreases due to non-continuous deposition
Solution Approach 1:
The patent maintains continuity of useful action by performing electroplating in a continuous manner with continuous modulation of current density. The process does not involve stopping and starting the deposition, but rather continuously varying the current density between two values to create the multilayered structure. This continuous operation achieves both improved corrosion protection through laminar structuring and maintained high productivity without interruptions
3Reliability
If multilayered zinc alloy coatings are formed using specialized equipment, then corrosion protection is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies universality by enabling standard electroplating equipment to perform the function of creating multilayered structures with improved corrosion protection. The invention makes the specialized pulse plating equipment unnecessary by using simple current density modulation that can be implemented with conventional equipment, thus achieving improved corrosion protection without increased manufacturing cost
Solution Approach 2:
The patent uses parameter changes (modulating current density between two values) to achieve the multilayered structure formation that previously required specialized equipment. This parameter modulation approach creates alternating layers with different properties using only standard electroplating equipment, thereby improving corrosion protection while reducing manufacturing cost and complexity
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 the production of laminar zinc alloy coatings with enhanced corrosion performance, suitable for industrial manufacturing, using standard equipment, and maintains effectiveness even after deformation, while reducing costs and complexity.
Implementation Method 1
Electrodepositing zinc-manganese alloys on a substrate can include introducing a cathode and an anode into an electrolyte solution comprising a metal salt, boric acid, an alkali metal chloride, polyethylene glycol, and a hydroxy benzaldehyde. Electrodepositing can further include passing a current between the cathode and the anode through the electrolyte solution to deposit zinc and manganese onto the cathode.
Data Source
AI summary
A method of forming a multilayered zinc alloy coating comprises steps of providing a bath of an aqueous electrolyte including zinc and a second electrodepositable component in an electrolytic cell having an anode and a cathode; applying a current or voltage between the anode and the cathode; modulating the applied current or voltage over time between at least two current or voltage values to thereby modulate the current density over multiple cycles between at least two current density values, wherein a first current density value is in a range of 0.3 to less than 2 A/dm2 and a second current density value is higher than the first current density value and is in a range of 0.6 to less than 5 A/dm2; and controlling the modulation of the applied current or voltage to obtain a multilayered structure having multiple layers of one or more of alternating proportions of the second component, alternating corrosion potential, alternating grain size, and alternating grain orientation, wherein one or more of the multiple layers has a thickness in the range of 1 to 10 μm.