Steel treatment agents, pretreatment agents, electroplating zinc

HL-212 Trivalent Chromium Black Zinc Passivator

An environmentally friendly trivalent chromium black‑zinc passivation agent suitable for cyanide‑free alkaline zinc plating, widely used in the automotive, electronics, and toy industries. The undiluted solution contains no hexavalent chromium and complies with IEC 62321 standards. It exhibits virtually no selectivity toward different types of zinc‑plating additives on the market. After treatment, the coating is bright black with excellent adhesion; when used in conjunction with a black‑zinc sealing agent, it delivers a uniform, glossy black finish, passing the neutral salt spray test for over 200 hours. Suitable for both rack plating and barrel plating, it is extremely easy to use. Even when the passivation time significantly exceeds the upper limit, the passivation film retains its black appearance until the coating has fully dissolved.

HL-230 High-Corrosion-Resistant Zinc-Nickel Alloy Trivalent Chromium Blue Passivator

The plating solution contains no hexavalent chromium and exhibits excellent corrosion resistance, making it widely applicable in the automotive, electronics, and other industries; it complies with IEC 62321 standards. The passivation film demonstrates superior thermal stability, maintaining outstanding corrosion resistance even after high‑temperature treatment. It produces a uniform, vibrant blue to cyan‑blue passivation layer, can be operated at room temperature, and is suitable for both rack plating and barrel plating. When the nickel content is 10–15% and the coating thickness is not less than 8 µm, neutral salt spray testing yields no white rust after 200 hours and no red rust after more than 1,000 hours; further enhanced corrosion resistance is achieved when used in conjunction with the HL‑218 sealing agent.

HL-232 Zinc-Nickel Alloy Trivalent Chromium Color Passivation Agent

The undiluted solution contains no hexavalent chromium and exhibits excellent corrosion resistance, making it widely applicable in the automotive, electronics, and other industries; it complies with IEC 62321 standards. The passivation film demonstrates high thermal stability, with corrosion resistance remaining unaffected even after high‑temperature treatment. The passivator offers stable performance and a long service life, suitable for both rack plating and barrel plating.

HL-233 Zinc-Nickel Alloy Trivalent Chromium Black Passivation Agent

An environmentally friendly trivalent chromium black passivation agent for zinc–nickel alloys, widely used in the automotive, electronics, and toy industries; the undiluted formulation is free of hexavalent chromium. The resulting coating exhibits excellent blackness and uniformity, with minimal color variation. When used in conjunction with the water-based sealant HL‑218 or the zinc‑black‑specific sealant HL‑220, it delivers a uniformly black, glossy finish and outstanding corrosion resistance, making it suitable for both barrel and rack plating processes.

HL-235 Zinc-Nickel Alloy Trivalent Chromium Clear Passivation Agent

The plating solution contains no hexavalent chromium and exhibits excellent corrosion resistance, making it widely applicable in the automotive, electronics, and other industries; it complies with IEC 62321 standards. It produces a uniform, naturally colored passivation film, operates at room temperature, and is suitable for both rack plating and barrel plating. When the nickel content is 10–15% and the coating thickness is at least 8 μm, neutral salt spray testing yields no white rust after 200–500 hours and no red rust after more than 1,000 hours. Combined with the HL‑218 sealant, it delivers outstanding corrosion resistance.

HL-201 Colorless Sealer

It can significantly enhance the corrosion resistance of blue‑zinc or colored‑zinc passivated surfaces, offering stable performance and a long service life, making it suitable for both rack plating and barrel plating applications. When applied to passivated parts, no additional water rinsing is required after treatment. Moreover, the treated parts are easy to strip, with standard acid etchants sufficient for removal.

HL-210 High-Corrosion-Resistant Trivalent Chromium Black Zinc Sealer

A single-component, trivalent chromium‑based liquid post‑treatment process—free of hexavalent chromium in the original solution—can significantly enhance both the appearance and corrosion resistance of black‑passivated zinc and zinc‑alloy coatings. The product is stable and boasts a long service life, making it suitable for both rack plating and barrel plating. After treatment, parts require no water rinsing, and the coating can be easily stripped using standard acid etchants.

HL-215 Series High-Corrosion-Resistant Zinc-Alloy Water-Based Sealer

Composed of a special acrylic copolymer emulsion, inorganic nanomaterials, water-soluble polymeric polymers, and other ingredients, this product synergistically seals and blocks pores, offering excellent dispersibility, film-forming properties, and sealing performance. The resulting transparent coating is widely used in automotive components, hardware, furniture, and other industries, significantly enhancing the corrosion resistance of galvanized and zinc–nickel alloy passivation films. It delivers outstanding color‑covering performance, with high gloss, no yellowing, superior hardness, and excellent leveling. Suitable for both rack plating and barrel plating, it has been specially formulated for white‑zinc and natural‑color zinc–nickel coatings. This fast‑drying formulation addresses challenges posed by low baking temperatures and short processing times, reducing costs while providing exceptional resistance to water‑induced whitening. It exhibits excellent water resistance, superior corrosion protection, and can extend salt‑spray test life by 1–2 times. Low‑odor, free of harmful substances, it is environmentally friendly and safe for health. It also minimizes adhesion to fixtures, simplifies stripping, and is easy to apply—either by immersion or spraying.

HL-216 High-Corrosion-Resistant Zinc Plating Sealer

A water-based sealer based on a special acrylic copolymer emulsion, featuring a transparent film layer. It is widely used in industries such as automotive components and hardware furniture slides, significantly enhancing the corrosion resistance of galvanized and zinc–nickel alloy passivation films. Fast-drying formulation addresses challenges posed by low baking temperatures and short curing times, reducing costs. It exhibits excellent resistance to whitening in water, outstanding water resistance, and superior corrosion protection, with salt‑spray performance improved by 1–2 times. Delivers exceptional color‑covering performance, high gloss, and no yellowing; boasts high hardness and excellent leveling. Specifically developed for white‑zinc and zinc–nickel finishes, it prevents adhesion to fixtures, simplifies stripping, and demonstrates excellent compatibility with a wide range of sealing systems, allowing direct addition and use.

HL-218 Series Ultra-Corrosion-Resistant Nano Aqueous Sealer

Water-based formulation with excellent anti-corrosion performance and strong adhesion; free of harmful substances such as formaldehyde, benzene, and heavy metals. After drying, it forms a transparent, glossy film that can serve as a final protective coating or an anti-rust primer, delivering superior film properties. Composed of a special acrylic copolymer emulsion, inorganic nanomaterials, water-soluble polymeric compounds, and other ingredients, this product synergistically seals pores and provides outstanding dispersibility, film-forming ability, and sealing performance. The resulting film is transparent and widely used in industries such as automotive components, hardware, and furniture sliding rails, significantly enhancing the corrosion resistance of galvanized and zinc–nickel alloy passivation films. Based on nano‑silica and compliant with IEC 62321 standards, this product is designed for zinc and zinc‑alloy coatings, extending neutral salt spray test durations by 100–200 hours. It is suitable for both rack plating and barrel plating, offering excellent color coverage, high gloss, no yellowing, high hardness, and excellent leveling. With a high concentration and low application rate, it is specifically formulated for white‑zinc and natural‑color zinc–nickel coatings. It resists sticking to fixtures, facilitates easy stripping, exhibits good compatibility with various sealing agents, and demonstrates excellent resistance to water whitening and alcohol wiping. Corrosion resistance is enhanced, with salt spray life improved by 1–2 times. Convenient to use—suitable for immersion or spraying—with strong dry and wet adhesion and flexibility. It remains color‑stable under high‑temperature baking and boasts unique resistance to alcohol wiping.