Aluminum Alloys FeCl₃+HCl

Chemical Etching Formula
Al5083 with FeCl₃+HCl

This reference describes how Al5083 responds to the FeCl₃+HCl etching formula. At a bath temperature of 40°C and concentration of 32 °Bé, the recipe holds an etch factor of about 2.52 and a typical production yield of 97.5%. It is intended as engineering reference data for design, sourcing, and process planning.

Formula Summary

The table below summarizes every parameter that defines this etching formula. Values listed as ranges scale with sheet thickness across the supported band.

FeCl₃+HCl Etchant System
32 °Bé Concentration
1.270 Specific Gravity
40 °C Bath Temperature
Through etch (double-sided) Etch Depth Type
0.05-0.5 mm Thickness Range
0.20 mm Typical Thickness
0.12-2.9 m/min Conveyor Speed Range
0.42 m/min Typical Speed
60-600 μm Min Hole Ø Range
100-500 μm Min Line Width Range
10-99 μm Undercut Range
2.52 Etch Factor (EF)
97.5% Typical Yield (96.8-97.9%)

Why FeCl₃+HCl for Al5083?

Ferric-chloride-based formulas are the industrial workhorse for ferrous, nickel, and copper-bearing alloys like Al5083. The Fe³⁺ ion oxidizes the metal surface; where HCl is present it regenerates dissolved species and stabilizes chloride concentration. The result on Al5083 is anisotropic etching with predictable undercut and an easily regenerated spent bath.

Process Window & Bath Control

The process window for this FeCl₃+HCl formula centres on 40°C and 32 °Bé. Conveyor speed spans 0.12-2.9 m/min over the 0.05-0.5 mm thickness band; the typical operating point is 0.42 m/min. Every 5°C drop in bath temperature requires roughly a 30% reduction in conveyor speed to hold the same etch depth, so temperature stability is the single biggest lever on consistency.

Design Rules & Tolerances

Feature sizes scale with sheet thickness. For this formula the minimum hole diameter ranges 60-600 μm and the minimum line width ranges 100-500 μm across the 0.05-0.5 mm band, following the industry 1.2× (hole) and 1.0× (line) thickness rules. Single-side undercut ranges 10-99 μm, and the etch factor is about 2.52. Size your photomask by subtracting twice the expected undercut from each finished feature dimension.

Design Rule Summary
• Minimum hole diameter range: 60-600 μm
• Minimum line width range: 100-500 μm
• Single-side undercut range: 10-99 μm
• Typical etch factor (EF): 2.52

Yield & Production Economics

Expect a yield in the 96.8-97.9% range for Al5083 with FeCl₃+HCl, with 97.5% typical on a well-controlled line. Most rejects trace back to upstream coating and exposure rather than to the etch bath itself, so tightening photolithography control is usually the fastest path to a higher number.

Typical Applications

Al5083 etched with this recipe typically ends up in lightweight RF shields, heat-spreader masks, nameplates, decorative trim, and lightweight structural lattices. Because chemical etching applies no mechanical or thermal load, the finished features are free of work-hardening and heat-affected zones — a decisive advantage over stamping or laser cutting for these uses.

More Aluminum Alloys Formulas

Other formulas in the same material family.

Al1060 FeCl₃+HCl Through etch (double-sided) Al1060 FeCl₃+HCl Through etch (double-sided) Al1100 FeCl₃+HCl Through etch (double-sided) Al2014 FeCl₃+HCl Through etch (double-sided) Al2017 FeCl₃+HCl Through etch (double-sided) Al2024 FeCl₃+HCl Through etch (double-sided)

Frequently Asked Questions

The recommended working concentration for Al5083 in the FeCl₃+HCl system is 32 °Bé, corresponding to a specific gravity of about 1.270. Titrate the bath at least once per shift and correct back toward this setpoint; drift below it signals depletion, while drift above usually means evaporative water loss.

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WET Etched runs production wet chemical etching lines using the FeCl₃+HCl chemistry. Send us your part drawing and quantity for a full process quote.

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