Trivalent-chromium natural-color passivator with high corrosion resistance for zinc-nickel alloy

A zinc-nickel alloy and trivalent chromium technology, which is applied in the coating process of metal materials, can solve the problems of passivation difficulties and the absence of zinc-nickel alloys, and achieve high passivation quality, high corrosion resistance, and stable performance. Effect

Inactive Publication Date: 2015-03-25
湖南领湃科技股份有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, zinc-nickel alloy passivation mainly focuses on trivalent chromium color passivation and blue-white passivation, and the formation of silver-white passivation film on zinc-nickel alloy has a large market demand, because the natural color passivation of zinc-nickel alloy is more difficult , there is no zinc-nickel alloy trivalent chromium passivator

Method used

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  • Trivalent-chromium natural-color passivator with high corrosion resistance for zinc-nickel alloy
  • Trivalent-chromium natural-color passivator with high corrosion resistance for zinc-nickel alloy
  • Trivalent-chromium natural-color passivator with high corrosion resistance for zinc-nickel alloy

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Effect test

Embodiment 1

[0019] The trivalent chromium high corrosion resistance natural color passivation agent 1L for zinc-nickel alloy in this embodiment includes 1 g of chromium sulfate, 1 g of cobalt nitrate, 5 g of oxalic acid, 1 g of sodium nitrate, 0.5 g of oxalic acid, 1 g of sodium saccharin, and lanthanum oxide 0.01g, made with deionized water.

[0020] Apply the trivalent chromium passivator of this embodiment to carry out the passivation of zinc-nickel alloy, the nickel content of the zinc-nickel alloy is 9%, the pH of the trivalent chromium passivator is 3.5, and the passivation temperature is 25°C. The passivation time was 18s, and the surface of the obtained coating was silvery white.

Embodiment 2

[0022] The trivalent chromium high-corrosion-resistant natural color passivator 1L for zinc-nickel alloys of this embodiment includes 6 g of chromium nitrate, 2 g of cobalt sulfate, 8 g of oxalic acid, 3 g of sodium nitrate, 1 g of oxalic acid, 3 g of sodium saccharin, and 0.1 g of cerium oxide. g, made of deionized water.

[0023] Apply the trivalent chromium natural color passivator of the present embodiment to carry out zinc-nickel alloy passivation, the nickel content of zinc-nickel alloy is 8%, the pH of described trivalent chromium natural color passivator is 3.6, and passivation temperature is 27 ℃, The passivation time was 15s, and the surface of the obtained coating was silvery white.

Embodiment 3

[0025] The trivalent chromium high corrosion resistance natural color passivation agent 1L for zinc-nickel alloy of this embodiment includes 8 g of chromium sulfate, 3 g of cobalt sulfate, 10 g of oxalic acid, 4 g of sodium nitrate, 3 g of oxalic acid, 5 g of sodium saccharin, and 0.3 g of lanthanum oxide. g, made of deionized water.

[0026] Apply the trivalent chromium passivator of the present embodiment to carry out the passivation of zinc-nickel alloy, the nickel content of the zinc-nickel alloy is 11%, the pH of the trivalent chromium passivator is 3.7, and the passivation temperature is 26°C. The passivation time is 20s, and the surface of the obtained coating is silvery white.

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Abstract

The invention relates to the technical field of metal surface treatment and protection and particularly relates to a trivalent-chromium natural-color passivator with high corrosion resistance for a zinc-nickel alloy. The trivalent-chromium natural-color passivator is prepared from trivalent chromium, cobalt salt, oxalic acid, sodium nitrate, ethane diacid, sodium saccharin, rear-earth salt and deionized water. The appearance and corrosion resistance of a passivation film are regulated by virtue of the rear-earth salt; the passivation film with silver-white appearance obtained after passivation is high in passivation quality, not only stable in performance but also high in corrosion resistance; moreover, trivalent chromium is relatively low in toxicity and high in environment friendliness, thereby completely conforming to the ROHS laws and regulations. A passivation method of the trivalent-chromium natural-color passivator with high corrosion resistance for the zinc-nickel alloy is simple in process and low in cost.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment and protection, in particular to a trivalent chromium passivator with high corrosion resistance and natural color for zinc-nickel alloys. Background technique [0002] With the development of science and technology and modern industry, zinc-nickel alloys are widely used in industries such as automobiles, motorcycles, and computers. However, the traditional zinc-nickel alloy passivation process adopts hexavalent chromium passivation process, and hexavalent chromium is a highly toxic and carcinogenic substance, and it is easy to cause serious pollution to the environment. Therefore, many countries have banned the use of hexavalent chromium Passivation technology, in recent years, China has also banned the use of hexavalent chromium passivation technology. Therefore, the development of passivators with low toxicity, environmental protection and good corrosion resistance is the key to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/46
CPCC23C22/46C23C2222/10
Inventor 侯柏龙黄超玉蔡志华陈蔡喜
Owner 湖南领湃科技股份有限公司
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