CN1045629C

CN1045629C - Golden-colour sweat-resistent copper-base alloy

Info

Publication number: CN1045629C
Application number: CN95109301A
Authority: CN
Inventors: 吴忍畊; 李仁顺
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-28
Filing date: 1995-07-28
Publication date: 1999-10-13
Anticipated expiration: 2015-07-28
Also published as: CN1141957A

Abstract

The present invention relates to a golden color sweat-resistant copper base alloy. The copper base alloy comprises the components by the following weight percentage: 15 to 25 % of Zn, 2 to 6 % of Al, 0.01 to 1.2 % of Si, 0.01 to 1.0 % of Re, and copper as the rest. The alloy samples treated by mechanically polishing have the fineness of 18k gold; after the copper base alloy is soaked in the synthetic sweat for 452 days, the copper base alloy has no rusty stains but maintains the golden yellow luster. The alloy has a good casting property, a press working property and solderability. The sigmab is from 240 to 260MPa, the delta is from 50 to 555, and the HB is from 50 to 60. The alloy is suitable for being produced into decorative parts and structural parts.

Description

Golden-colour sweat-resistent copper-base alloy

The present invention relates to a kind of copper base alloy, particularly the golden copper base alloy of sweat proof liquid etch.

In the prior art, disclosed patent has: United States Patent (USP): US.36.655.367; US.3.958.322; US.3.988.633; US.4.113.475; US.4.493.736; US.4.589.938. Japanese Patent: JP61.143.545; Jp61.243.141; JP85.041.692.The gild alloy of these patent documentations report is formed by its principal element and roughly can be divided three classes, i.e. xantal base, and brass base and aluminum brass base alloy contain one or more trace elements, as Au, Pt, Pd, In, Ir, Ag, Ti etc. in these matrixes.

Germany patent DE3235873 issue in 1984 contains 1-7%Sn, and the copper alloy of 1-7%Al is used to make clock and watch, jewellery, trophy etc.Chinese patent CN87102903 in 1987, golden darkening proof copper base alloy for docoration and manufacture method (announcement on April 6th, 1988).These two patents are respectively that no rare earth is an alloy with containing rare earth copper aluminium tin, though have very near the color and luster of gold and certain corrosion resisting property, soak time promptly tarnished in the longest 45 days in the synthetic perspiration, another shortcoming of this alloy system is that process industrial art performance is relatively poor, and promptly casting fluidity is poor, and shrinking percentage is big, cast(ing) surface is easy to produce casting flaw, ftracture easily during the ingot casting hot rolling, thereby yield rate is lower, cost is higher.

In April, 1994, China corrosion and protection association builds and can step on the research of imitating the gold copper corrosion behavior by academic nd Annual Meeting collected papers of 15 anniversaries, by document report data, there is the anti-discoloration of two alloys better, be their anti-discolouring time in the synthetic perspiration of CuAlZnNiSnPIn (IG412) and CuZnNiSn2rIn (IG593) to be respectively another alloy (IG11 65 minutes and 70 minutes ₂) 32 days only anti-discolouring time.

The objective of the invention is at CuAlSnRE be alloy sweat proof liquid etch poor performance, casting fluidity is poor in the practice of essence casting art ware, form shortcomings such as defective easily, new alloy system is proposed, task is to seek to be suitable for the alloy material that big industrial production is used for manufacturing of decorative structure spare and large usage quantity, require with low cost, good processability has corrosion resisting property preferably.

Main points of the present invention are the component of alloy, its (weight percent): 15-25%Zn that thes contents are as follows, and 2 6%Al, 0.1-1.2%Si, 0.01-1.0%RE, all the other are Cu.A preferable alloy component of the present invention is 15-25%Zn, 2-6%Al, and 0.1～1.2%Si, 0.2～1.2%Sn, 0.01～1.0%RE, surplus is Cu.Founding: join the brass common process and in crucible, make Cu-Zn alloy liquation by molten, add aluminium and aluminium silicon master alloy again, stir,, add tin and rare earth element (or rare earth intermediate alloy) at last with sodium aluminum fluoride refining slagging-off.With bell jar they are buckled under the liquid level, can cast after stirring.Pouring temperature is 1050 ℃～1150 ℃.

Homogenizing annealing and hot rolling; Ingot casting, after surperficial milling, heating is 840-880 ℃ in air furnace, is incubated open rolling in 1 hour.Hot stove charging.The open rolling deflection is less than 25%, if rolling by six times, total deformation can reach 88%.Require roll to give heat to 300 ℃.

Alloy of the present invention has the color and luster of 18k gold, and is the same outside and inside, grinds and more demonstrates gild alloy and be better than imitation gold deposit one class technology greatly.

This alloy does not contain noble element, and alloying constituent all adopts the rich element that produces of China.And give full play to strengthening effect and the melting technology simple advantage of zinc in copper; Employing can generate alloying element aluminium, silicon, the tin of compact and firm protective film; Add the trace rare-earth element that can play delicate effect again.Put it briefly, adding Si+Sn+RE or Si+RE have formed new sweat proof alloy on the aluminum brass basis.Reasonably prescription guarantees that alloy sample soaks and still do not have rusty stain afterwards in 452 days, keeps golden yellow gloss in the synthetic perspiration.The synthetic perspiration tests and adopts the SG282-83 of China National Light Industrial Products Department Stainless Steel Watch Band corrosion test standard to carry out, and the sweat prescription is the NaCl10 gram, lactic acid 1 gram, and urea 1.5 grams are made into 1000 ml water solution, splash into its pH value of ammoniacal liquor matter and reach 4.2.35 ± 2 ℃ of test temperatures were soaked 36 hours, the no rusty stain in surface.

Join 5 kilograms of alloy pigs by the tested alloys prescription is molten again, sample soaks in the synthetic perspiration after the hot rolling, and corrosion resisting property obtains repetition, illustrates that this alloy formula has good sweat proof liquid etch performance.Through revision test repeatedly, this alloy system also has good comprehensive performances, smart casting, and welding, hot rolling, drawing performance are all fine, σ _b=240～260MPa, δ=50-55%, HB50～60 are suitable for making decoration and structural part.

Embodiment one:

Alloy component is that the add-on of 20%Zn, 4%Al, 1.0%Sn, 0.8%Si and rare-earth elements La+Ce is 0.15%.Molten joining obtains molten alloy in 30 kilograms of crucibles of oil oven heating, adds tin and rare earth again, pours in the plycast, obtains the smart casting of the complicated art of height undulations goods, and casting quality is good, and throwing successively, quality reaches the 18k gold.The alloy pig hot rolling is made sample polishing back and is soaked in the synthetic perspiration, and solidity to corrosion substantially exceeds the desired standard of SG 282-83 tentative specification.

Embodiment two:

Alloy has 24%Zu, 2.5%Al, 0.8%Sn, 0.5%Si and is that the mishmetal add-on of main component is 0.2% with La and Ce.Molten joining obtains molten alloy in 30 kilograms of crucibles of oil oven heating, the liquid temperature remains on more than 1100 ℃, and stove adds Sn and RE outward, static moments later cast, obtain 25 * 100 * 300 millimeters spindles, heat in the stove after the milling of surface, 850-880 ℃ of insulation rolls into the plate of 6 mm thick, 650 ℃ of annealing after 1 hour, through pickling and cold-rolling to 2 millimeter, be cut into sample, the polishing back is soaked in the synthetic perspiration and was still kept golden yellow pool earlier, no rusty stain in 452 days.

Embodiment three:

Alloy formula 15%Zn.5.5%Al, 0.6%Si, 1.2%Sn, rare-earth elements La+Ce add-on 0.1%.Melt in 30 kilograms of crucible oil ovens, join by brass is molten earlier, add aluminium silicon and aluminium then, coming out of the stove adds tin and rare earth again.Teeming temperature is higher than 1050 ℃.Obtain accurate art casting premium casting, surface quality is intact.Throw successively, color and luster reaches the 18k alloy.As-cast specimen soaks in the synthetic perspiration and still kept bright color and luster in 250 days.

Embodiment four:

Alloy formula is 21%Zn, 3.0%Al, 0.3%Si, and the La+Ce add-on is 0.1%.Molten joining in the electric furnace crucible, with sodium aluminum fluoride refining slagging-off, stove adds Sn and rare earth outward in the stove.Cast the sample that is rolled into 2 mm thick behind the ingot, the suitable 18k gold of polishing back color and luster is dipped into 96 days its color and lusters and remains unchanged in the synthetic perspiration.

Claims

1. golden-colour sweat-resistent copper-base alloy is characterized in that the component (weight percent) of this alloy is: 15-25%Zn, and 2-6%Al, 0.1-1.2%Si, 0.01-1.0%RE, surplus is Cu.

2. according to the described copper base alloy of claim 1, it is characterized in that adding 0.2-1.2%Sn in its component, surplus is Cu.