Deep holes, high temperatures, and corrosion resistance? This water-soluble chloride-based zinc plating additive handles it all.

HL-613 Water-Soluble Chloride Zinc Plating Additive

In chloride‑based zinc plating, issues such as uneven coating on deep‑hole workpieces, inadequate bath stability at elevated temperatures, and difficulty in achieving the required corrosion resistance have long plagued many manufacturers. Guangdong Haolun Environmental Technology has introduced HL‑613, a water‑soluble additive for chloride‑based zinc plating, precisely addressing these industry‑wide pain points. As the first in China to apply an aldehyde‑sulfonation‑based, carrier‑free water‑soluble technology to chloride‑based zinc plating, it overcomes the shortcomings of conventional systems—poor salt‑spray resistance—and of benzalacetone‑based systems—limited deep‑plating capability and abundant decomposition byproducts—delivering overall performance that ranks among the world’s leading levels.

HL-613 Water-Soluble Chloride Zinc Plating Additive

1. Exceptional deep-plating capability, suitable for machining complex workpieces.

The issues of incomplete or thin plating in hard-to-plate areas such as deep holes and recesses are the primary challenges in zinc plating. Thanks to its specially formulated composition, HL‑613 delivers far superior deep‑plating performance compared with conventional cyanide‑based zinc‑plating processes. Whether using rack plating or barrel plating, it enables the plating bath to effortlessly penetrate every hidden corner of the workpiece.

It ensures uniform current distribution across the workpiece surface, whether in the concealed recesses of automotive components, the deep‑hole structures of precision hardware, or irregularly shaped, complex parts. It enables zinc ions to penetrate precisely into every minute corner, forming a coating with consistent thickness and fine, well‑defined crystallization. This eliminates the awkward situation of “a bright surface but incomplete plating inside,” significantly boosting the pass rate for electroplating of intricate parts and making even the most challenging substrates easy to plate.

2. Excellent stability across a wide temperature range, ensuring continuous and reliable production.

In high-temperature chloridic zinc plating operations, the stability of additives directly determines whether production can proceed smoothly. HL‑613 boasts exceptional high‑temperature resistance, with an operating temperature range spanning 16–65°C and a cloud point exceeding 100°C. As a result, it delivers consistent performance whether faced with the scorching heat of summer workshops or environmental fluctuations caused by seasonal temperature variations.

More importantly, its formulation boasts exceptional stability and generates minimal decomposition byproducts, allowing the plating bath to remain clear and transparent over extended periods and minimizing the adverse effects of impurity buildup on coating performance. This eliminates the need for frequent impurity removal, reduces the frequency of additive‑ratio adjustments and regular bath‑purification treatments, and lowers overall processing frequency—resulting in greater operational convenience and reduced total production costs. Notably, it features a high concentration of brightener with low consumption, and its usage rate remains stable even as bath temperature rises, further curbing production losses. These attributes significantly simplify operation and maintenance, ensuring consistent coating quality in large‑scale, continuous production.

3. Excellent corrosion resistance, suitable for a wide range of applications.

The corrosion resistance of the coating directly determines the product’s service life. The zinc layer formed by HL‑613 exhibits a dense, smooth microstructure with low porosity, offering corrosion resistance comparable to that of alkaline zinc coatings. It delivers outstanding performance in salt spray tests, providing long‑term, reliable protection for the workpiece.

It also boasts exceptional versatility: it is suitable for a wide range of base materials, including low‑carbon steel, high‑carbon steel, carburized steel, cast iron, and powder‑metallurgy components. Moreover, it meets the dual demands of aesthetic appeal and corrosion resistance in applications such as automotive parts and precision hardware, and can even handle workpieces that require secondary machining after plating. In addition, the product generates minimal foam and has a low COD, complying with stringent wastewater discharge standards and helping to significantly reduce environmental treatment costs.

In addition, this product exhibits excellent salt tolerance: even when the potassium chloride concentration in the plating bath reaches 300 g/L, the brightener remains stable and does not precipitate or cause turbidity, while also enhancing the bath’s throwing power and further reducing the frequency of brightener replenishment.

4. Compatible with multiple systems; easy to switch cylinders and simple to operate.

HL-613 boasts exceptional system compatibility, seamlessly integrating with a variety of chloride-based zinc‑plating systems, including potassium, ammonium, and sodium salts. Among these, the ammonium‑salt bath outperforms conventional potassium‑salt baths in resisting impurity interference—such as Fe²⁺ and Cu²⁺—and in preventing discoloration of the coating. It is particularly well suited to the high‑efficiency production demands of automated lines and can be directly incorporated into existing manufacturing processes without requiring extensive equipment modifications.

Switching between old and new processes is seamless: whether your existing system uses domestically produced or imported brighteners, you can upgrade simply by adding the new formulation or performing a straightforward tank change.

Applicable Scenarios

Automotive manufacturing and parts industry: automotive chassis components (such as bolts, nuts, and brackets), engine components (such as sensor housings and fuel line fittings), body structural parts, interior hardware, and more.

Precision hardware and mechanical manufacturing industry: precision instrument components (such as gears, bushings, and connectors), general‑purpose mechanical parts (such as bearings, valves, and fasteners), and custom‑shaped hardware items (such as deep‑hole tools and stamped parts), among others.

Electronics and electrical appliances industry: Companies that manufacture small, precision‑engineered components such as connectors, plug‑in terminals, and sensor housings, where stringent requirements are imposed on coating uniformity.

Hardware Tools and Daily Necessities Industry: hand tools, housings and accessories for power tools, furniture hardware, kitchen and bathroom hardware, and more.

Summary

HL-613 water-soluble chloride-based zinc plating additive, with its outstanding deep‑plating capability, high‑temperature stability, excellent corrosion resistance, and broad substrate compatibility, is widely used across multiple industries that demand superior plating quality, production reliability, and environmental compliance. It is particularly well suited for complex‑shaped components and applications requiring high‑end protective coatings.

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