Precision Alloys FeCl₃+HCl

Chemical Etching Formula
1J22 Iron-Cobalt Alloy with FeCl₃+HCl

This reference describes how 1J22 Iron-Cobalt Alloy responds to the FeCl₃+HCl etching formula. At a bath temperature of 52°C and concentration of 44 °Bé, the recipe holds an etch factor of about 2.68 and a typical production yield of 96.2%. 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
44 °Bé Concentration
1.410 Specific Gravity
52 °C Bath Temperature
Through etch (double-sided) Etch Depth Type
0.05-0.2 mm Thickness Range
0.10 mm Typical Thickness
0.33-2.6 m/min Conveyor Speed Range
0.92 m/min Typical Speed
60-240 μm Min Hole Ø Range
100-200 μm Min Line Width Range
9-37 μm Undercut Range
2.68 Etch Factor (EF)
96.2% Typical Yield (95.9-96.3%)

Why FeCl₃+HCl for 1J22 Iron-Cobalt Alloy?

On 1J22 Iron-Cobalt Alloy, 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 1J22 Iron-Cobalt Alloy etch line runs a variant of this formula.

Process Window & Bath Control

Hold the bath at 52°C with concentration 44 °Bé (specific gravity 1.410). Across the 0.05-0.2 mm thickness range, conveyor speed runs from 0.33-2.6 m/min — thinner sheets move faster, thicker sheets slower, in roughly inverse proportion to thickness. A typical mid-range setpoint is 0.92 m/min for 0.10 mm stock. Use redundant PID temperature control to hold the bath within ±1.5°C, and titrate at least once per shift.

Design Rules & Tolerances

Design rules for this recipe: hole diameter 60-240 μm, line width 100-200 μm, single-side undercut 9-37 μm — all as a function of thickness across 0.05-0.2 mm. The higher the etch factor (this formula holds about 2.68), the tighter the achievable tolerance. Below the minimum feature sizes, yield falls off steeply, so treat those numbers as hard floors rather than targets.

Design Rule Summary
• Minimum hole diameter range: 60-240 μm
• Minimum line width range: 100-200 μm
• Single-side undercut range: 9-37 μm
• Typical etch factor (EF): 2.68

Yield & Production Economics

Expect a yield in the 95.9-96.3% range for 1J22 Iron-Cobalt Alloy with FeCl₃+HCl, with 96.2% 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

1J22 Iron-Cobalt Alloy etched with this recipe typically ends up in hermetic sealing rings, lead frames matched to glass/ceramic, and magnetic shielding. 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 Precision Alloys Formulas

Other formulas in the same material family.

1J46 Permalloy FeCl₃+HCl Through etch (double-sided) 1J50 Permalloy FeCl₃+HCl Through etch (double-sided) 1J79 Permalloy FeCl₃+HCl Through etch (double-sided) 1J85 Super-Permalloy FeCl₃+HCl Through etch (double-sided) HyMu80 (Permalloy) FeCl₃+HCl Through etch (double-sided) Invar36 alloy FeCl₃+HCl Through etch (double-sided)

Frequently Asked Questions

Both standard dry-film photoresists (typically 1.5–2.0 mil) and aqueous-developable liquid resists are compatible with FeCl₃+HCl at 52°C. Resist choice is driven by resolution: features near the fine end of the 100-200 μm line-width range usually call for liquid resist, while larger features can use lower-cost dry film.

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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