IS CHROME PLATING THE SAME AS HEXAVALENT CHROMIUM IN ROHS?

It used to be only the same, but now it is not the same.

1. The characteristics of hexavalent chromium becoming trivalent chromium.

Color appearance: The color is elegant and soft, without the dazzling blue-white of hexavalent chromium plating, but very attractive similar to the color of fine-polished stainless steel, which is the chromium plating color obtained by the most mature trivalent chromium plating process in the field of electroplating.

The coating has good corrosion and wear resistance

The corrosion and wear resistance of the trivalent chromium plating with the same thickness is better than that of the hexavalent chromium plating.

The coating absolutely does not contain hexavalent chromium, lead, cadmium, mercury harmful heavy metals, and meets the requirements of environmental protection and health

Since the trivalent chromium electroplating process uses electroplating raw materials that do not contain hexavalent chromium, lead, cadmium and mercury that have been tested by authoritative testing institutions, including anodes, plating solutions, additives and other major aspects, the flow of the above-mentioned heavy metals such as hexavalent chromium into the process is controlled from the source.

There are some differences in the appearance of electroplating hexavalent chromium and trivalent chromium, which are as follows:

1.Hexavalent chromium: usually a deep silvery-white color, sometimes blue or green. Under sunlight or other light sources, there will be a noticeable specular reflection effect, with very good corrosion resistance and metallic luster.

2.Trivalent chromium: usually dark gray or dark brown, sometimes yellow or brownish-red. Unlike hexavalent chromium, its surface does not show obvious specular reflection and is relatively dull, but its corrosion resistance and rust resistance are very good.

In general, hexavalent chromium plating has the advantages of high gloss and beautiful appearance, and is widely used in automotive, construction, furniture and other industries; Although the appearance of trivalent chromium plating is relatively ordinary, it has gradually been paid attention to and widely used due to its environmental friendliness and good corrosion resistance.

Dear users, the appearance of electroplating hexavalent chromium and trivalent chromium is different. Hexavalent chromium plating has a silvery-white appearance, a high gloss and reflectivity, and strong corrosion resistance and wear resistance, so it is often used in automobiles, machinery and equipment. The appearance of trivalent chromium plating is light blue or light green, which has better environmental protection performance than hexavalent chromium plating, so it is widely used in some special fields, such as food processing, medical equipment, etc.

In general, hexavalent chromium plating and trivalent chromium plating differ in appearance and performance, and should be chosen according to specific needs.

The appearance of electroplated hexavalent chromium is very different from that of trivalent chromium, which has a metallic gray surface and is duller, while trivalent chromium has a starry sky-like appearance with a bright gold color, which is more visually appealing. In addition, the surface of hexavalent chromium is smoother, while the surface of trivalent chromium is rougher, and its fine bumps can be felt by hand.

The appearance of electroplating hexavalent chromium and trivalent chromium is different.

Hexavalent chromium usually has a very bright and smooth silver appearance. Hexavalent chromium plating can provide very high corrosion and wear resistance, and can also be used as a decorative coating, for example for automotive parts, furniture, and appliances.

In contrast, trivalent chromium is typically light blue or green in color, and its appearance may not be as bright and smooth as that of hexavalent chromium. Trivalent chromium plating is mainly used to protect metals from corrosion and oxidation, such as in automotive parts, mechanical parts, and pipes.

The common appearance of electroplating hexavalent chromium is dark gray, with a smooth gray-green film on the surface, strong corrosion resistance, and a certain wear resistance.

Electroplating trivalent chromium has a bright silver appearance, with a layer of silver-white film on the surface, which has poor corrosion resistance, but has good protection performance and good appearance effect.

1.Slightly different.

2.Electroplating hexavalent chromium usually presents a dark gray color with a metallic luster, which is relatively bright; The appearance of electroplated trivalent chromium is a dull silver-gray color, which is relatively plain.

3.It is worth mentioning that electroplating hexavalent chromium is usually used in occasions that require higher corrosion resistance, such as automobiles, furniture and other industries; Electroplating trivalent chromium is widely used in some items in daily life, such as faucets.

Summary. Electroless plating does not require an external current and can carry out chemical reactions spontaneously; The electroplating is carried out under the condition of re-impressed current, and the chemical reaction cannot be carried out spontaneously without the impressed current, and the reaction mechanism is also different, and the redox reaction under the condition of autocatalytic electroless plating. Electroplating requires an applied current and anode, while electroless plating relies on an autocatalytic reaction that occurs on a metal surface.

Electroplating is not possible to coat the entire surface of some parts with complex shapes, but electroless plating has been used to coat workpieces of any shape. Because of the applied current, the plating speed is faster than that of electroless plating, and the plating of the same thickness is completed earlier than electroless plating. The adhesion of electroless plating is generally higher than that of electroplating.

The difference between electroless chrome plating and electrochrome plating.

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Electroless plating does not require an external current and can carry out chemical reactions spontaneously; The electroplating is carried out under the condition of re-impressed current, and the chemical reaction cannot be carried out spontaneously without the impressed current, and the reaction mechanism is also different, and the redox reaction under the condition of autocatalytic electroless plating. Electroplating requires an applied current and anode, while electroless plating relies on an autocatalytic reaction that occurs on a metal surface. Electroplating is not possible to coat the entire surface of some parts with complex shapes, but electroless plating has been used to coat workpieces of any shape.

Because of the applied current, the plating speed is faster than that of electroless plating, and the plating of the same thickness is completed earlier than electroless plating. The adhesion of electroless plating is generally higher than that of electroplating.

First, the degree of pollution of the two is different.

1. The degree of pollution of electroplating 3-valent chromium: the harm of 3-valent chromium is small, and the pollution degree of electroplating 3-valent chromium is reduced.

2. Degree of pollution of electroplating chromium 6 valent: chromium 6 is highly toxic and seriously pollutes the environment.

Second, the application of the two is different.

1. Application of electroplating of 3-valent chromium: Compared with hexavalent chromium plating, decorative chromium plating with trivalent chromium has many excellent characteristics, but there are also some problems in practical application, and its platingability is limited to a certain extent. Therefore, the plating of functional chromium with trivalent chromium has not yet been widely used in practice.

2. Application of electroplating of chromium 6-valent: the use of chromium hexavalent in electronic products is often used as chromic acid in the electrochemical industry. It is also used as a colorant in pigments (i.e. lead chromate) and as a corrosion inhibitor (sodium dichromate) in cooling water circulation systems such as heat absorption pumps, industrial freezers and refrigerator heat exchangers.

3. The hardness of the coating layer is different.

1. The hardness of the plating layer of electroplating 3-valent chromium: low, but if it is heat treated at a certain temperature, the hardness can reach HVL200 1800, and the wear resistance is also greatly enhanced.

2. The hardness of the plating layer of electroplating 6-valent chromium: the hardness of the plating layer of electroplating 6-valent chromium is lower than the hardness of the plating layer of electroplating 3-valent chromium.

Hexavalent chromium exists in the form of oxygenates, which are mainly orange in acidic solutions and yellow in alkaline solutions, and have strong oxidizing properties in acidic environments.

Hexavalent chromium is an inhalation extremely toxic substance with a lasting risk to the environment, but these are the properties of hexavalent chromium, and chromium metal, trivalent or quadrivalent chromium does not have these toxicities.

The hexavalent chromium treatment method is mainly the adsorption method of biological materials, and the non-living biological materials can quickly bind metal ions, which can be used for the enrichment of metals and the removal of heavy metal ions from water. <>

Trivalent chromium should be green and hexavalent chromium should be orange-red.

Blue is bivalent chromium, (dark) green is trivalent chromium, and (orange) red is hexavalent chromium.

Chromium is a silvery-white, hard metal. It mainly occurs in three forms: metallic chromium, trivalent chromium and hexavalent chromium. All chromium compounds are toxic, with hexavalent chromium being the most toxic.

Chromium has a wide range of industrial uses, mainly in the metalworking, electroplating, and tanning industries, and the wastewater and exhaust gases emitted by these industries are the main sources of pollution in the environment. Chromium metal is a high melting point iron-gray solid used in the manufacture of steel and other alloys. Chrome metal does not exist in its natural state, it is extracted from chrome ore.

Industrially, hexavalent chromium is obtained by heating trivalent chromium in minerals under aerobic conditions, such as in metal finishing. Hexavalent chromium has been shown to be the most dangerous occupational health hazard.

Hexavalent chromium is a swallowed poison Inhalation is extremely toxic, ** exposure may cause sensitivity; It is more likely to cause hereditary genetic defects, may cause cancer if inhaled, and pose a lasting danger to the environment. But these are the properties of hexavalent chromium, and chromium metal, trivalent or tetravalent chromium does not have these toxicities. Hexavalent chromium is easily absorbed by the human body, and it can enter the human body through digestion, respiratory tract, ** and mucous membranes.

It has been reported that there are different degrees of hoarseness, nasal mucosal atrophy, and in severe cases, nasal septum perforation and bronchiectasis. When it invades the digestive tract, it can cause vomiting and abdominal pain. When invaded by **, dermatitis and eczema will occur.

The most harmful is the carcinogenic risk when exposed to or inhaled for long or short-term periods.

All in all, it's a highly toxic substance that can cause cancer, and the big news recently is that the "cancer village" is because the water contains hexavalent chromium, and the villagers drink it, causing cancer.

Go see that movie that never compromises, Juliet. Roberts played, that is, hexavalent chromium!!

Hexavalent chromium refers to the +6 valence state of chromium in chromium compounds, which is also corresponded to trivalent chromium, which is 100 times more toxic than trivalent chromium.

Chromium compounds have now been classified as a Class 1 human occupational carcinogen by the International Agency for Research on Cancer, so be careful of hexavalent chromium contamination.

It is chromium in a certain compound with a valency of positive 6 valence.