Electro Plating, High-Purity Solvents

S-carboxyethylisothiuronium betaine (ATPN)

S-carboxyethylisothiuronium betaine, commonly known by the acronym ATPN, is a sulfur-containing organic compound identified by CAS number 5398-29-8. Structurally, it represents an isothiuronium betaine derivative where a carboxyethyl group is attached to the sulfur atom, resulting in a zwitterionic molecule. This chemical acts as a crucial intermediate in various industrial syntheses, particularly within the field of electroplating and metal surface treatment. As a specialized additive, ATPN is highly valued for its ability to regulate the deposition process of nickel and copper, ensuring a high degree of luster and uniformity on the substrate. Its unique molecular architecture allows it to function effectively as a leveling agent and brightener, mitigating surface defects and enhancing the aesthetic appeal of finished components. Furthermore, ATPN exhibits stable chemical properties under standard operating conditions, making it a reliable component in acidic plating baths where precise control over crystallization and grain refinement is essential for industrial quality.

Attributes

Key Features and Benefits

Superior Leveling Capabilities: Effectively smooths microscopic surface irregularities during metal deposition.
Excellent Brightening Effect: Enhances the mirror-like finish in decorative nickel plating applications.
Zwitterionic Molecular Structure: Provides high solubility and compatibility within acidic electrolyte solutions.
Enhanced Bath Stability: Remains active and effective even during prolonged electrolysis cycles.
Low Consumption Rates: High efficiency allows for significant results at low concentrations.
Improved Ductility: Reduces the internal stress of the plated layer, preventing cracking or peeling.
Broad pH Tolerance: Functions reliably across various acidic ranges in plating baths.
Synergistic Compatibility: Works well with other organic additives to achieve superior surface quality and appearance.

Specifications

Technical Highlights

Molecular Formula: C6H12N2O2S representing a complex sulfur-nitrogen heterocyclic derivative.
Melting Point Range: Typically exhibits a high melting point exceeding 200 degrees Celsius.
Appearance: Available as a white or off-white crystalline powder with high purity levels.
Solubility Profile: Easily dissolves in water and aqueous acidic media for direct bath addition.
Chemical Stability: Resistant to hydrolysis and thermal decomposition within standard metal finishing environments.
Purity Specification: Standard commercial grades maintain a minimum assay of ninety-eight percent.
Storage Sensitivity: Hygroscopic nature requires airtight storage in cool, dry conditions to maintain product integrity.
Reaction Chemistry: Acts as an electrophilic sulfur source in various synthesis.

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

Acidic Nickel Plating: Used as a primary brightening and leveling agent in Watts-type baths.
Copper Electroplating: Enhances surface smoothness and grain refinement in acidic copper plating processes.
Electronics Industry: Utilized for high-precision plating of printed circuit boards and electronic connectors.
Automotive Finishing: Applied in the production of decorative chrome and nickel components for vehicles.
Metal Surface Modification: Serves as a chemical intermediate for synthesizing other sulfur-based surfactants.
Decorative Hardware: Employed in the manufacture of shiny bathroom fixtures and ornamental metal items.
Aerospace Engineering: Used for corrosion-resistant coatings requiring high uniformity and thin-film integrity to meet the most demanding technical specifications.