Zinc-nickel alloy plating process, passivators, sealants

Galvanized sealant

Galvanized sealant

Galvanized sealant

Galvanized sealant

Galvanized sealant

Potassium chloride zinc plating additive

It was the first to apply aldehyde sulfonation—a water‑soluble, carrier‑free technology—to chloride‑based zinc plating, overcoming the poor thermal stability of conventional aldehyde systems and the inadequate deep‑plating capability and excessive decomposition byproducts of benzalacetone‑based systems, achieving overall performance at an internationally leading level. Its deep‑plating capability surpasses that of cyanide‑based zinc plating, making it particularly well suited for workpieces with deep holes or recessed areas; it is compatible with both rack plating and barrel plating. In low‑current regions, it delivers excellent brightness, reaching a mirror‑like finish; zinc deposition is rapid, with fast brightening, and it exhibits superior leveling, producing a clear, vibrant coating. The deposit is soft and has low brittleness, ideal for post‑plating secondary operations. The plating bath is highly heat‑resistant, with an operating temperature range of 16–65°C and a cloud point exceeding 100°C. Additives are stable, generating minimal decomposition products, ensuring long‑term clarity and transparency of the bath. The brightener concentration is high while consumption is low—only one‑quarter to one‑third of that required in traditional processes. It offers superior salt resistance, expands the high‑current density range, and is compatible with potassium, ammonium, and sodium salts. Tank changes are straightforward, with low foaming and low COD, meeting wastewater discharge standards. Moreover, it provides excellent corrosion resistance, making it suitable for automotive components, precision hardware, and other applications.

HL-690 Alkaline Zinc-Nickel Alloy Electroplating Process

The alkaline cyanide-free process is suitable for both barrel plating and rack plating, producing a uniform, high-quality zinc–nickel coating with a nickel content of 12%–16%. The coating exhibits excellent brightness, uniform nickel distribution, superior throwing power and deep‑plating capability, enabling electroplating of relatively complex workpieces. The coating displays a silvery metallic luster; its alloy composition shows low dependence on current density. In salt‑spray tests, its corrosion resistance exceeds that of electro‑galvanized coatings by more than fivefold. It also demonstrates outstanding heat resistance, and after high‑temperature treatment, its corrosion resistance ranks among the best in zinc and zinc‑alloy electroplating. At a cathodic current density of 1 A/dm² in standard working solution, the deposition rate is approximately 0.20–0.25 μm/min (laboratory data). With a Vickers hardness of Hv 350–450, this coating is the hardest within zinc and zinc‑alloy electroplating systems, offering excellent scratch resistance. Its nickel content is evenly distributed, and its fine-grained microstructure facilitates easy passivation, resulting in a bright, uniform finish that can be further treated with colorless, blue, colored, or black finishes.

Ultra-corrosion-resistant trivalent blue-white passivator

An environmentally friendly trivalent chromium blue‑white passivation agent for zinc plating, widely used in the automotive, toy, and electronics industries. The undiluted formulation is free of hexavalent chromium and passes the boiling water test, meeting IEC 62321 standards. Employing innovative materials and processes, it breaks through the limitations of conventional trivalent chromium blue‑white zinc coatings. Acid zinc barrel plating achieves a NSS test duration of over 96 hours, while cyanide‑free alkaline zinc rack plating withstands NSS testing for up to 300 hours. It offers a broad operating window with a wide pH range, allowing use from low to ambient temperatures. The resulting blue‑white finish is uniform and aesthetically pleasing, resisting yellowing even after prolonged storage. The passivation process features slow zinc dissolution, enabling excellent corrosion resistance even with thin coatings. The bath exhibits high tolerance to impurities, extending the replenishment cycle, and is suitable for various zinc‑plated substrates—whether applied by barrel or rack plating, on automated lines or manually—and is particularly well‑suited for automated rack‑plating systems.

Ultra-corrosion-resistant trivalent color zinc passivator

An environmentally friendly trivalent chromium‑based colored passivation agent, widely used in the automotive, toy, and electronics industries. The undiluted formulation contains no hexavalent chromium and passes the boiling water test, meeting IEC 62321 standards. Its innovative process delivers exceptional corrosion resistance: acid zinc barrel plating achieves a NSS test duration of up to 150 hours, while cyanide‑free alkaline zinc rack plating withstands NSS testing for as long as 500 hours. The passivation process features slow zinc dissolution, yielding thin coatings with excellent corrosion resistance, high tolerance to impurities in the bath, and extended replacement intervals. Suitable for all types of zinc‑plated substrates, the passivation film exhibits a color shift over time—from reddish‑yellow to reddish‑green—resulting in a rich, uniform appearance and brilliant luster. It is compatible with both barrel and rack plating, and can be applied on manual or automated production lines.

HL-211A Acid Zinc Trivalent Chromium Nickel-Free Black Zinc Passivator

An environmentally friendly, single‑component trivalent chromium black passivation agent suitable for potassium chloride–based zinc plating. It offers a broad process window, simple operation, and easy maintenance, and is widely used in the automotive, electronics, and toy industries. The undiluted formulation contains no hexavalent chromium or nickel salts and complies with IEC 62321 standards. It forms a uniform, deep‑black, highly protective passivation film on the zinc‑plated surface, with a glossy, jet‑black finish. Suitable for potassium chloride–based acidic zinc plating, it can be applied via barrel or rack plating; during barrel‑type or robotic arm‑assisted passivation, it also helps to repair surface marks caused by impact and friction. In neutral salt spray testing, it delivers a white‑rust resistance of 48 to 120 hours, and its wastewater treatment is straightforward.