JPS58107466A - Exterior parts for portable watch - Google Patents

Abstract

PURPOSE:To provide exterior parts for a portable watch with improved corrosion resistance and cutting property, obtained by using an alloy consisting of Ni, Cr, Mo, Fe, Cu, Nb and C in a specific ratio as a base material. CONSTITUTION:An alloy consisting of, on the wt. basis, 18-23% Cr, 7-10% Mo, 1-10% Fe, 2-6% Cu, 2% or less Nb, 0.06% or less C and the remainder consisting of Ni and inevitable impurities is prepared. By using this alloy as a base mateial, exterior parts for a portable watch excellent in corrosion resistance and good in processability is obtained inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention (b) improves the corrosion resistance and workability of a nickel nine-base alloy, and relates to an exterior part (f) for a portable watch made of a material $1#F.

Conventionally, 1 watch exterior parts were made of austenitic stainless steel.
For example, 1BOr-8Ni stainless steel has been widely used for 911. However, when the exterior parts have complex VrFlt parts, sweat and sea water act on the interstitial parts during carrying, causing corrosion, which is known. Even though I used Or-Ni-Mo alloy nickel-funded brass, I couldn't find anything satisfactory *'
The above phenomenon was more severe in cases where the plating was too strong, such as with an Itr mesh band.

In addition, in recent years, watches have become increasingly thinner and smaller. Materials with excellent corrosion resistance, workability, and mechanical properties are being used as materials for exterior parts.

An object of the present invention is to provide an exterior part f for a portable watch using a material with improved corrosion resistance and improved rigidity.

The components of the alloy according to the invention are as follows in weight ratio:

0r18~25% MO7~10 10 1~10 0u 2~6Nt)
2 or less o ao 6 or less Hl Residual Next, the effect of adding each component and the reason for the limitation of silk vl standard review will be described.

Ni1j base metal as Or, Mof enough IIr
It is an element that improves corrosion resistance and increases alloy strength by hardening.

Or is an element that has a remarkable effect of improving corrosion resistance and also improves the strength of the alloy. The 15-inch corrosion-resistant tube in the N1 base is shown, but is it sufficiently corrosion-resistant? In order to maintain this, it is necessary to use Ftj 18m above the 25gb pipe, and the alloy has poor malleability and is difficult to process.

MO is a corrosion-resistant water-containing T7. containing a halogen ion tube. The corrosion resistance after plating of the mesh pan y is affected by the casting effect, and if it exceeds 10, the heat cutability and rigidity deteriorate.

'Fetj' This is the original perforation that impairs corrosion resistance, but it is useful for improving rigidity.The purpose is to manufacture the material at low cost.

Since it is treated as a ferro-dye alloy, it is necessary to insert f, but the upper limit for corrosion resistance is 10, and it is necessary to insert a! 116 lower and 1.
Ta.

Cu has the effect of deteriorating collection resistance or increasing the potential as an alloy due to its high electrode potential with respect to hydrogen, and improving resistance to local battery corrosion due to potential difference with plating and rigidity. The rigidity side is set at h22, and the chemical resistance side is set at 6.
It was lower than g6.

It is an element that stabilizes nbtio and prevents the decline in corrosion resistance due to grain boundary precipitation of carbide, and at the same time increases the hardness of alloy ma). The temperature was set to 2 mo or less in order to prevent a decrease in

Since it combines with Odor to form Or carbonization*f* and deteriorates the corrosion resistance of the tube, it is necessary to reduce ζ as much as possible.

The effect of tuna fish was also taken into consideration when choosing o, ob@su.

Next, actual Ni examples of the present invention are shown.Table 1 shows the composition in terms of weight ratio, and Table 2 shows the results. The edge material of the corrosion resistance test sample was prepared as a wire material of 25 x 25 mm and a mesh pant size of A6 vml.

Table Table mosquito -) Ko The test method was a salt spray test conducted by JXBK.

A test of artificial sweat immersion at 5°C for 5 days was completed.

Punt made of 808514L material as a dog comparison sample.

In the case of KI [It red rust occurred on the entire band surface.

However, the nine bands obtained with the present invention are rarely used.

α11 for pitting potential! The Ill constant value at Im/d was taken as that value.

Rigidity level 5: A load of 500 grams fm was applied to a Dahaine drill.

As described above, when the material according to the present invention is used, it is possible to provide a tube for an exterior part for a portable watch that has excellent corrosion resistance, good workability, and is inexpensive.

Claims (1)

[Claims] Weight ratio 0r18~2591* Mo7~109L7・
1-109G, Ou2-6q4. Nb211 lower Cα06
- An exterior part for a portable watch characterized by f4I using an alloy consisting of the remainder M1 and unavoidable impurities as a material.