Electrochemical Machining (ECM)
Fe → Fe2+ + 2e−
Overview
Electrochemical machining dissolves metal from a workpiece (anode) in a controlled pattern using a shaped cathode tool and flowing electrolyte (typically NaCl or NaNO₃ solution). Material removal rates of 0.5–15 mm³/s are achieved without tool wear, heat-affected zones, or mechanical stress. The process mirrors the shape of the tool electrode.
Participants
| Role | Substance | Coefficient | State |
|---|---|---|---|
| Reactant | Iron Fe | 1 | (s) |
Everyday Example
Turbine blades for jet engines are precision-shaped by ECM to achieve complex airfoil profiles impossible to machine conventionally.
Industrial Importance
ECM is used in aerospace, medical implants, and die/mold making for machining hard alloys and complex geometries.
Properties
- Type
- Electrochemical
- Reversible
- No
- Energy
- Endothermic
- ΔH
- 89.0 kJ/mol
Related Reactions
Alkaline Battery Discharge
Anodizing of Aluminum
Cathodic Protection (Zinc Sacrificial Anode)
Chlor-Alkali Electrolysis
Chrome Electroplating
Copper Electroplating
Daniell Cell (Zinc-Copper Galvanic Cell)
Electrochemical CO₂ Reduction to CO
Electrolysis of Molten NaCl (Downs Process)
Electrolysis of Water
Frequently Asked Questions
What is the equation for Electrochemical Machining (ECM)?
The balanced equation is: Fe → Fe²⁺ + 2e⁻.
What type of reaction is Electrochemical Machining (ECM)?
Electrochemical Machining (ECM) is a electrochemical reaction.
Is Electrochemical Machining (ECM) exothermic or endothermic?
Electrochemical Machining (ECM) is endothermic (absorbs energy). The enthalpy change (ΔH) is 89.0 kJ/mol.