Hydroxyethylidene Diphosphonic Acid (HEDP) is a highly efficient organic polyphosphonic acid compound. Due to its excellent chelating ability, stability, and high-temperature resistance, it is widely used in various industrial fields. Its main applications can be summarized as follows:

• Water Treatment: As a core scale and corrosion inhibitor, it is used in boiler water, circulating cooling water, and oilfield water injection systems. By chelating metal ions such as calcium and magnesium, it prevents scale deposition and protects metal pipelines from corrosion. Related videos demonstrate its practical application effects:
• Electroplating Industry: In cyanide-free electroplating, it serves as the main complexing agent for preparing copper plating solutions (dosage: 15–20 g/L), resulting in strong coating adhesion and a smooth surface. Soaking metal substrates in a 1%–2% solution before electroplating activates the surface and improves plating effectiveness.
• Electronics Industry: Electronic-grade HEDP is used in semiconductor grinding, polishing, and etching processes to enhance processing efficiency and product smoothness. In PCB etching, it reduces burrs and optimizes copper foil surface quality.
• Textile Printing and Dyeing: As a color-fixing agent, it enhances dye adhesion, prevents fading, and improves fabric quality.
• Daily Chemicals and Others: In detergents, it softens water and prevents soap scum formation.

In the above applications, HEDP is often compounded with agents such as polyhydroxy acids to enhance synergistic effects.