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What is the progress of new chromium-free passivation technology in the field of electro-galvanizing?

What is the progress of new chromium-free passivation technology in the field of electro-galvanizing?

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  • Time of issue:2023-03-16
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(Summary description)What is the progress of new chromium-free passivation technology in the field of electro-galvanizing? Electroplating is also one of the most commonly used techniques for the corrosion protection of metals. Chromium-free passivation treatment is a chemical technology. It is the process of changing the surface of a metal or coating from an active state to a passivated state by chemical or electrochemical means. So let's take a look at the progress of the new chromium-free passivation technology in the field of electro-galvanizing.

What is the progress of new chromium-free passivation technology in the field of electro-galvanizing?

(Summary description)What is the progress of new chromium-free passivation technology in the field of electro-galvanizing? Electroplating is also one of the most commonly used techniques for the corrosion protection of metals. Chromium-free passivation treatment is a chemical technology. It is the process of changing the surface of a metal or coating from an active state to a passivated state by chemical or electrochemical means. So let's take a look at the progress of the new chromium-free passivation technology in the field of electro-galvanizing.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2023-03-16
  • Views:0
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What is the progress of new chromium-free passivation technology in the field of electro-galvanizing? Electroplating is also one of the most commonly used techniques for the corrosion protection of metals. Chromium-free passivation treatment is a chemical technology. It is the process of changing the surface of a metal or coating from an active state to a passivated state by chemical or electrochemical means. So let's take a look at the progress of the new chromium-free passivation technology in the field of electro-galvanizing.

Electrogalvanizing is currently widely used in shipbuilding industry, machinery industry, aviation, construction and many other fields.

In recent years, China's economy has developed rapidly, and galvanized steel sheets are one of the steel products with the fastest growth rate in domestic consumption.

Since the electrode potential of zinc is relatively negative, when galvanized iron and steel parts are corroded by corrosive media, zinc acts as an anode to corrode first to protect the iron matrix, so galvanizing is a simple and effective method to improve the corrosion resistance of steel.

Due to the active nature of zinc, especially in an unventilated hot and humid environment, the galvanized layer is easily corroded as an anode, forming dark gray or white loose corrosion products, which greatly weakens the corrosion resistance of the galvanized layer. Red rust will appear, thus losing the anti-corrosion effect. In order to improve the corrosion resistance of the galvanized layer, it is generally necessary to carry out an appropriate chromium-free passivation treatment on the galvanized layer to improve the thermodynamic stability of the galvanized layer in the environment.

The chromium-free passivation treatment of the galvanized layer can not only significantly improve the corrosion resistance of the galvanized layer, but also improve the decorative appearance of the galvanized parts. Therefore, the chromium-free passivation process of galvanized layer is widely used in many fields such as machinery industry, electronics industry, instrument industry and light industry.

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How to achieve environmentally friendly chromium-free passivation of aluminum alloys and other metals

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From chromate passivation to chromium-free passivation, what kind of advancement has the galvanized passivation technology experienced?

As a surface-covering protective layer, metals often require additional protective measures to ensure that they meet the corrosion resistance requirements in a certain environment. For example, when zinc is used as a metal surface covering layer, it needs to have sufficient thickness to protect the base metal, mainly relying on the sacrificial anode function of the zinc layer and the dense basic zinc carbonate film formed on the zinc surface in the atmosphere and neutral water environment isolation protection.
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Technology sharing丨Chrome-free passivation solution Yuanmoto®L632 formula for aluminum alloy

Aluminum chromium-free passivation solution Yuanmoto®L632 is a chromium-free chemical conversion coating process suitable for aluminum materials, including pure aluminum, aluminum alloys and aluminum die-casting parts; it is composed of silicon-titanium-based main salt and film-forming aids , organic acids, etc., without phosphorus, chromium, lead, cadmium and other heavy metals and other harmful organic substances, safe and environmentally friendly; after treatment, a uniform, dense and nearly transparent film can be formed on the surface of the aluminum material. Excellent anti-corrosion performance, the almost transparent film layer can maintain the glossiness of the aluminum surface for a long time, and avoid the formation of spot rust caused by mold on the surface of the aluminum during long-term storage. Or painted to provide good adhesion. This product is used at room temperature, with low tank concentration, stable performance, high production efficiency and low overall cost.
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