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

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.

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.

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.

Process Equipment & Material Reference

Process equipment for the 1J22 Iron-Cobalt Alloy / FeCl₃+HCl combination is built around our precision acid cleaning machine platform — closed-loop temperature control, redundant pump headers, and metering for bath replenishment all directly affect the etch factor and yield numbers cited on this page.

The Cobalt chemical etching guide reference goes one level above the recipe shown here, surveying the full thickness range, depth options, and common subgrades we run for cobalt.

Production Use Cases for This Formula

Parts produced with this 1J22 Iron-Cobalt Alloy + FeCl₃+HCl formula end up in a wide range of finished products. Representative production runs we have completed using this exact recipe family include stainless steel shower-head filter mesh, stainless steel metal filter mesh, and soy-milk-maker filtration mesh. Each case shares the same root sensitivity: clean photoresist edges, a tightly held bath SG of 1.410, and a conveyor speed inside the 0.33-2.6 m/min envelope.

Designs that sit slightly outside this thickness or feature-size envelope are usually addressable by a sister formula in the same etchant family. The bath chemistry stays the same; the tuning shifts to conveyor speed and resist choice.

Other Metals Etched with FeCl₃+HCl

The FeCl₃+HCl chemistry is also documented for these alloys.

More Precision Alloys Formulas

Other formulas in the same material family.

Frequently Asked Questions