Cobalt Alloys FeCl₃+HCl

Chemical Etching Formula
0Cr21Al6Nb with FeCl₃+HCl

The FeCl₃+HCl chemistry is a proven formula for 0Cr21Al6Nb. This reference sheet lists the concentration (44 °Bé), specific gravity (1.410), bath temperature (50°C), and the full range of conveyor speeds and feature tolerances that result. Use it to size your process before committing to a production trial.

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
44 °Bé Concentration
1.410 Specific Gravity
50 °C Bath Temperature
Through etch (double-sided) Etch Depth Type
0.1-0.3 mm Thickness Range
0.20 mm Typical Thickness
0.17-0.9 m/min Conveyor Speed Range
0.32 m/min Typical Speed
120-360 μm Min Hole Ø Range
100-300 μm Min Line Width Range
19-58 μm Undercut Range
2.60 Etch Factor (EF)
95.9% Typical Yield (95.6-96.2%)

Why FeCl₃+HCl for 0Cr21Al6Nb?

On 0Cr21Al6Nb, the ferric chloride system attacks the alloy's oxide layer continuously while ferric ions drive dissolution. It is regenerable, compatible with standard photolithography, and produces clean burr-free edges — which is why nearly every 0Cr21Al6Nb etch line runs a variant of this formula.

Process Window & Bath Control

Bath control for 0Cr21Al6Nb in FeCl₃+HCl: temperature 50°C, concentration 44 °Bé, specific gravity 1.410. The recipe is tuned for through etch (double-sided). Conveyor speed is the primary throughput control, ranging 0.17-0.9 m/min across the supported thickness range. Check specific gravity each shift with a calibrated hydrometer and correct with fresh make-up or water as needed.

Design Rules & Tolerances

When laying out artwork for 0Cr21Al6Nb at through etch (double-sided), plan for a minimum hole diameter in the 120-360 μm range and a minimum line width in the 100-300 μm range, depending on the chosen sheet thickness within 0.1-0.3 mm. The etch factor of ~2.60 and undercut range of 19-58 μm determine how much the mask must be biased to land the finished dimension on target.

Design Rule Summary
• Minimum hole diameter range: 120-360 μm
• Minimum line width range: 100-300 μm
• Single-side undercut range: 19-58 μm
• Typical etch factor (EF): 2.60

Yield & Production Economics

Typical mass-production yield for 0Cr21Al6Nb in the FeCl₃+HCl system is 95.9%, within an observed range of 95.6-96.2%. The dominant yield-loss modes are photoresist pinhole defects and rinse-water contamination. Improving incoming sheet quality and photoresist coating consistency gives the highest yield-improvement leverage for this formula.

Typical Applications

Parts produced with the FeCl₃+HCl formula on 0Cr21Al6Nb are common in wear-resistant blades, springs, and high-temperature precision parts. The burr-free, stress-free nature of chemical etching makes it the preferred process wherever flatness and edge quality matter more than raw throughput.

More Cobalt Alloys Formulas

Other formulas in the same material family.

0Cr25Al5 Resistance Alloy FeCl₃+HCl Through etch (double-sided) 1Cr13Al4 Resistance Alloy FeCl₃+HCl Through etch (double-sided) L605 Co-Cr-W Alloy FeCl₃+HCl Through etch (double-sided)

Frequently Asked Questions

Typical mass-production yield is 95.9%, within an observed range of 95.6-96.2%. The leading yield-loss modes are photoresist pinhole defects and rinse contamination, so the fastest route to a higher number is tighter incoming-sheet and coating control rather than changes to the etch bath.

Need a Quote for This Process?

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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