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720 Rule Equation:
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The 720 Rule is a simple formula used in anodizing processes to calculate the time required to achieve a specific coating thickness based on the current density applied. It provides a quick estimation method for anodizing professionals.
The calculator uses the 720 Rule equation:
Where:
Explanation: The constant 720 represents the relationship between coating thickness, current density, and time required for the anodizing process.
Details: Accurate time calculation is crucial for achieving consistent coating thickness, ensuring product quality, and optimizing production efficiency in anodizing processes.
Tips: Enter the desired thickness in mils and the current density in A/sq ft. Both values must be positive numbers greater than zero.
Q1: What is the origin of the 720 constant?
A: The constant 720 is derived from the relationship between coating thickness, current density, and the electrochemical equivalent of aluminum.
Q2: How accurate is the 720 rule?
A: The 720 rule provides a good estimation for standard anodizing processes but may need adjustment for specific electrolyte compositions or temperature variations.
Q3: What are typical current density values used in anodizing?
A: Typical current densities range from 12-24 A/sq ft for conventional anodizing, but can vary based on the specific process and desired results.
Q4: Can this calculator be used for hard anodizing?
A: While the basic principle applies, hard anodizing often uses different parameters and may require adjustments to the calculation.
Q5: What factors can affect the accuracy of this calculation?
A: Electrolyte concentration, temperature, alloy composition, and agitation can all influence the actual time required for a specific thickness.