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Method for inhibiting dezincification of brass

a technology of dezincification and brass, applied in the field of brass alloy, can solve the problems of poor corrosion resistance of brass alloy, relatively low melting point, etc., and achieve the effect of good cutting and mechanical properties

Inactive Publication Date: 2017-04-20
NATIONAL CHUNG HSING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The addition of niobium significantly improves dezincification resistance and cutting performance, providing durability in high-temperature environments without releasing toxic elements, with a 95% increase in dezincification inhibition capability and improved mechanical properties.

Problems solved by technology

Compared to copper or other copper alloys, brass alloy has a good cutting property, but exhibits poor resistance to corrosion.
However, lead has a relatively low melting point, and selective corrosion of the brass alloy-made component, such as dezincification of the lead-containing brass pipe, tends to occur when the brass alloy-made component is used in a chlorine-containing water environment.
Dezincification may seriously damage the structure of the lead-containing brass pipe, and decrease the lifespan thereof.
Moreover, lead may be released from the lead-containing brass pipe into water delivered by the potable water system, causing water contamination.
However, since, similar to lead, bismuth has a low meltingpoint, addition thereof in the brass alloy may render the brass alloy vulnerable to cracking under the high temperature environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0014]The following examples are provided to illustrate the embodiment of the invention, and should not be construed as limiting the scope of the invention.

Sources of Chemicals

[0015]1.Copper block: purchased from Shin Chung Industrial

[0016]Co., Ltd.[0017]2.Zinc block: purchased from Lai-I Metal Industrial Co., Ltd.[0018]3.Niobium powder: purchased from Well-Being Enterprise Co., Ltd.

examples 1 to 4 (

EX1 to EX4)

Preparation of Brass Alloy Including Brass and Niobium

[0021]The brass alloys of Examples 1 to 4 were prepared under conditions similar to those of Comparative Example except that each of the brass alloy compositions of Examples 1 to 4 further includes a niobium powder.

[0022]The brass alloy compositions of Examples 1 to 4 are shown in Table 1.

TABLE 1CuZnNb(g)(g)(g)EX11861240.062EX2173.4115.60.116EX3154.2102.80.28EX4180.56124.440.63

Evaluation Items

1. Component Analysis

[0023]Each brass alloy of Examples 1 to 4 and Comparative Example was cut into a test piece. Each test piece was subjected to component analysis by an inductively coupled plasma mass spectrometer (ICP-MS).

[0024]The results are shown in Table 2.

TABLE 2Element Concentration or AmountNiCuZnNbSnPbTest Pieceppmwt %wt %wt %ppmppmCE48.5460.1739.72—14.2897.96EX147.2259.2239.580.02932.2282.12EX238.5559.8839.120.05134.1177.53EX351.3459.5339.660.06243.2873.87EX449.1959.3239.730.07735.4680.86Detection Limit0.0900.0830.562...

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Abstract

A brass alloy with dezincification inhibition capability and good cutting and mechanical properties is provided. The brass alloy includes niobium and brass. Niobium is in an amount ranging from 0.01 to 0.15 part by weight and brass is in an amount ranging from 99.85 to 99.99 parts by weight based on 100 parts by weight of the brass alloy.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is a continuation application of and claims priority under 35 USC 120 to co-pending U.S. patent application Ser. No. 14 / 597,164, filed on Jan. 14, 2015, which claims priority under 35 USC 119 to of Taiwanese Application No. 103101603, filed on January 16, 2014.FIELD OF THE INVENTION[0002]The invention relates to a brass alloy with dezincification inhibition capability and good cutting and mechanical properties, more particularly to a brass alloy comprising niobium and brass.BACKGROUND OF THE INVENTION[0003]Brass alloy is mainly composed of copper and zinc. Brass alloy also contains a small amount of another metal based on the desired use, such as lead, tin, aluminum and the like. Compared to copper or other copper alloys, brass alloy has a good cutting property, but exhibits poor resistance to corrosion.[0004]Conventionally, brass alloy contains a small amount of lead in order to improve the cutting property, so as to be s...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C9/04
CPCC22C9/04C22C1/02
Inventor WU, WEI-TEHUNG, CHANG-YU
Owner NATIONAL CHUNG HSING UNIVERSITY