JPS6223203B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention improves the corrosion resistance of burners used in places with severe corrosive environments, such as cookers. Conventional structure and its problems Burners currently used in cooking devices such as gas stoves are used in high-temperature environments where steam and water droplets are scattered, and seasonings, soybean oil, and sauces used for cooking are also present. It is subject to extremely severe corrosive conditions due to constant adhesion of salt, etc., and contact with sulfur compounds, nitrogen compounds, and carbides generated from cooking food and combustion gas, and ordinary metal materials corrode in a short period of time. There is a drawback. In order to improve some of these corrosion resistances, conventionally, gas burners for iron castings have been surface treated by forming a plating film, such as electroplating with nickel or chrome, melt plating with aluminum, or coating with silicone heat-resistant paint. It has been done. but,
Plating made of nickel, chrome, aluminum, etc. corrodes from pinholes, corners, etc. and the material is exposed immediately, so the plating effect cannot be obtained. Burners coated with silicone-based heat-resistant paints or inorganic heat-resistant paints can be used in relatively high-temperature environments, but corrosion occurs due to unavoidable pinholes in the paint film, causing blistering and peeling of the paint film. This caused further severe corrosion to occur. Furthermore, burners for cooking appliances easily become dirty due to boiling spills, etc., so when cleaning them with a scrubbing brush, they have the disadvantage that they have low abrasion resistance and can easily flake off or wear out due to wear. Therefore, a burner made of brass has been proposed and put into practical use as a burner that partially improves these drawbacks.
However, although this brass has considerable corrosion resistance in the atmosphere and has excellent machinability, when boiled liquid containing salt etc. adheres to it at high temperatures, zinc melts from the surface, making it porous and brittle. It has the disadvantage of causing so-called dezincification corrosion, which turns into a layer, in a short period of time. Considering only from the perspective of corrosion resistance, expensive metal materials with excellent corrosion resistance, such as stainless steel,
Corrosion resistance may be improved by using gold, platinum, etc., but it is considered to be impractical in terms of machinability, economy, etc. In particular, stainless steel is considered to have high corrosion resistance, but it lacks machinability and there are concerns about stress corrosion cracking, crevice corrosion, pitting corrosion, etc. Furthermore, gold lacks wear resistance and economic efficiency, so it is difficult to solve these problems. It is not easy to solve and use. Purpose of the Invention The purpose of the present invention is to eliminate these drawbacks and improve durability, corrosion resistance, and economical efficiency. Structure of the Invention In order to achieve the above object, the gas burner of the present invention is made of a metal that is corrosion resistant, machinable, and economical, and is forged or cast by adding phosphorus and antimony to brass. It is characterized by using a dezincification-resistant corrosion-resistant copper alloy manufactured by the method. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, a burner head 1 and a burner body 2 are detachably attached, and by joining them, a flame hole 3 is formed between them, and the burner is protected against dezincing, especially to which corrosive boiling liquid containing salt etc. adheres. It is constructed from a corroding alloy. Since the gas burner with the above configuration is used in harsh corrosive environments such as gas stoves as described above, its effectiveness was confirmed through various corrosion tests. (1) Results of salt spray tests Table 1 shows the results of spraying a 5% NaCl aqueous solution for 200 hours in a 35°C atmosphere on gas burner heads for cookers such as gas stoves, which were prototyped by forging and casting various metal materials. Furthermore, in addition to the salt spray test, a similar test was performed in which the samples were immersed in a saline solution (Cl ^- concentration: 2000 ppm) at 85°C for 200 hours, and the same results as shown in Table 1 were obtained. From Table 1, it was confirmed that there was no abnormality in the burner head of this example.

【table】

[Table] (2) Corrosion resistance test results in cooking atmosphere Corrosion tests were conducted by dropping a solution of oil diluted to 50% with water onto the surface of a burner head maintained at approximately 300°C in an actual cooking atmosphere. was carried out. The results are shown in Table 2. From Table 2, it was confirmed that there was no abnormality in the burner head of this example.

[Table] (3) Results of dezincification corrosion test Burner heads prototyped from various copper alloys with excellent machinability were tested according to the Swedish Building Standard.
Table 3 shows the results of the dezincification corrosion test using the method (immersion in a 1% CuCl ₂ aqueous solution at 75±3°C for 24 hours). From Table 3, it was confirmed that the burner head of this example was free from dezincification corrosion, similar to the bronze casting (BC-6).

[Table] From the above experimental results, the burner head made by forging or casting by adding phosphorus and antimony to the copper alloy as in this example has excellent machinability while retaining the excellent machinability of the copper alloy and is resistant to dezincification corrosion. It was confirmed that it improved. Next, Fig. 2 shows the results of a dezincification corrosion test for burner heads with different phosphorus contents in the copper alloy. Second
The figure shows that when 0.02% or more of phosphorus and 0.02% or more of antimony are added to a copper alloy, dezincification corrosion begins to decrease rapidly. Effects of the Invention As described above, the burner of the present invention has excellent dezincification corrosion resistance while maintaining excellent machinability and economic efficiency. It has great corrosion resistance even when used in corrosive environments, making it very practical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a gas burner according to an embodiment of the present invention, and FIG. 2 is a diagram showing the dezincing resistance characteristics of the same brass depending on the phosphorus and antimony content. 1... Burner head, 2... Burner body, 3...
...Flame hole.

Claims (1)

[Claims] 1. A gas burner made of a dezincification-resistant copper alloy made by adding phosphorus and antimony to brass. 2. The gas burner according to claim 1, which is made by adding 0.02% or more of phosphorus and 0.02% or more of antimony to brass.