We are Your Surface Finishing Partner
Since 1931, We have provided surface finishing services
for various industry field products.
These are used in electronics parts, automotive parts,aerospace parts, and medical applications.

We have provided Excellent plating services
・ Gold-tin alloy plating with high reliability soldering bonding,high melting point
・Reel-to-Reel Process with High Level Partial Plating services.
・Plating for Bumps
・High Reflective Gold
Plating film
・Nickel Plating for Wire Bonding ・Hard Silver Plating film・Heat Resistant Silver plating film …and more.

when request to the research and development stage,
we can offer a process to meet the customer requirements.

Please Feel Free to Contact Us !!

We are Your Surface Finishing Partner
Gotanda Factory

Hachioji Factory

Factory that is specialized
in noble metal plating・Gold-plated accept with the purpose (10 types).
・Various noble metal plating (gold, silver,etc.).

Factory that is specializedin plating for package products
・Gold-tin alloy plating with high reliability
soldering bonding, high melting point.(280℃)
・Whisker-free tin alloy plating (non lead).

We have four Excellent factories
Yonezawa Factory

Factory that is specialized
in professional Reel-to-Reel plating
・Stripe, partial high-variety low-volume
manufacturing
・Direct gold-plated on SUS material
・Excellent hard silver plating (Not Reel-to-Reel)

Kofu Factory

Factory that is specializedin RoHS compliance・Trivalent chromate coatings.
・Aluminum chemical conversion treatmentusing trivalent chromium.

Please Feel Free to Contact Us !!

New Hard Sliver Plating FilmHardness
Standard Silver

New Hard Silver

Hv 80～110

Hv 150～180

We have provided New Hard Silver Plating
Contact ResistanceStandardSilver
0.60

Unit:(mΩ)

New HardSilver
0.76

Resistance to Discoloration

Resistance Equivalent to Standard Silver
Measure by resistance Tester(type:CRS-113-AU)
Made by yamasaki-seiki Co., Ltd.
※Condition:100gf (n=3)

Coefficient of Friction

Test of drop ammonium sulfide(JIS H 8621)

1.4
StandardSliver

1.2

New Standard
SilverCoefficient ofFriction

1.0

New hard Silver

0.8
0.6

0.4
0.2

0.0
020

406080Distance (m)Standard Silver

As Plating

24 hours

No Discoloration due to Sulfide

TRIBOMETER PIN-ON-DISK※Condition:
Load 0.5N
Rotations(Speed/Total 100rpm/1000times
φ6mm SUS304

Lower than Standard Silver

亜鉛高ニッケル合金めっきZinc-Nickel
Alloy Plating
Zn-Ni alloy that has high nickel content offers
high corrosion resistance
Result of the salt spray test (ISO 9227)
No white rustZn

No red rust

Zn-Fe
Sn-Zn

Zn-Ni(Ni:5-8%)
Zn-Ni(Ni:13-17%)
01000
Spray time (hour)

2000

3000

•Substrate: Fe•Plating film thickness:8μm(After trivalent chromium conversion coating<Properties of the high nickel content Zn-Ni alloy>•High-corrosion resistance: The Zn-Ni alloy(high nickel content) has
the most high-corrosion resistance in zinc alloys.
•It shows five times or more corrosion resistance than Zn.
•It shows more than twice corrosion resistance than Zn-low Ni alloys.
•High heat resistance: It shows excellent corrosion resistance andadhesion under high temperature.
•Compliance with environmental regulations: Our processes andequipments are designed to ensure compliance with all applicable
environmental regulations and permits.
•Plating processes: We can offer the high nickel content Zn-Ni alloy
coating with barrel and a lack plating.

Direct Noble Metal Plating on Stainless SteelEx) Silver plating sample viewed by SEMFeCrNiAgWithout Nickel

We have developed a process for noble metal (Au,Ag,Sn)
plating directly on stainless steel.
Au plating part

Stainless steel part
Stainless steel partSn plating part

We will provide high quality products.
Don’t Worry about Nickel allergy.

Please Feel Free to Contact Us !!

Direct heat resistive Silver plating process
on the stainless steelWe can directly to the silver plating stainless steel.
This does not involve peeling or discoloration caused by a high-temperatureenvironment.

To conventional Silver plating on SUSFeEx.）Nikel and Silver plating on SUS430
CrNiAgThere is nickel under-layer plating on stainless steel .

Dilect Silver Plating on SUSEx.）Direct Silver plating on SUS430
FeCrNi

It is definite that Tin plate on stainless steel directly.

Heat-resistanceIt keeps adhesion
without discoloration ofheat treatment at 750 ℃.

HeatTreatment
Before heat treatment

After heat treatment• We provide it at the same price as the regular silver plating.
• From prototype to mass production, we deliver high-quality products.

Pease do not hesitate to consult.

AgPorous
NickelPlating
Do you needthese materials?
Do you need these materials ?

Materials withlarge specificsurface?

Materials withmicro asperity
surface?
Then ･･･

We can provide porous nickel plating
Porous Nickel Surface

Porous Nickel Section

Material

In this process・・・
 The porosity is about 40 million/cm2.
 The pore size is changeable depending on plating conditions .
Applications
・Before surface for painting ・Surface modification
・Fuel Cell Parts ・Substrate for packing materials , ETC.

Bump plating technology to a wafer
Please order bump plating to the various wafers used for semiconductor parts.
The diameter of bump：100μm
・Magnification *10

Enlargement

・Distance
1：100.90μm2：53.92μm
3：100.92μm
4：52.53μm
・Difference inheight
5：3.00μm
6：3.01μm

φ50μm

φ100μmφ150μmφ200μm【The track record of our company】• In the specification of electroplating and electroless plating, the surface-mounted
component for smart phones has a track record.
• Similarly , we have a track record in the silicon wafer etc.
• Various materials and various sizes should trial-production-give an order (Thecorrespondences of 4 inches wafer ).
• Please do not hesitate to consult with the demand from a research-and-development stage.
• Moreover, we’ll propose the process of suiting a visitor's demand.

Pease do not hesitate to consult.

Gold-Tin Alloys
OutlineWe have provided Gold-Tin alloy plating technologies. Gold-Tin alloys haveused in high temperature and high strength joint soldering field.
Plating films of Gold-Tin alloy are thinner than sheet or ribbon solder materials
and deposited only on demanded area.
Our plating films are uniform in composition and thickness.
We can gain eutectic composition as well as some types of compositions.

Thinner Alloy Film
The alloy film thickness is controlled by plating conditions and therefore thefilm is be able to thinner than that of sheet or ribbon materials.

Wide range of contents
The films have various contents by various plating conditions.

Fine deposition
The films can be formed on fine patterns.

High reliability joint
We can offer the plating film as high reliability solder joint materials
Because Gold of excellent oxidation resistance and mechanical properties.

High-temperature Solder℃

We can offer the plating film as lead-freesolder of 280℃ of melting point.
As Gold-Tin alloys have relatively highmelting point in solder, they have used in aprocess which demands two or three ofsoldering.

280020100wt%(Tin)

Figure1. Eutectic phase diagram

Table1. Melting point of Tin and Tin Alloys
Characteristic
Plating types Melting point
Typical lead-free solder plating
Tin
230℃
Excellent mechanical properties
Tin-Antimony 235℃
High-temperature Solder
Gold-Tin alloy 280℃

Three kinds of high level partial plating.
・Since Ni-Au-Sn can process at one hoop line,
it can respond at short time for delivery.
・Partial Au plating cuts cost!
・It is possible to plate on thedemanded parts with simple jigs.
Partial Sn plating

The whole of undercoat is Ni

Partial Au plating【Image 】
Plating is possible
when the height is 0.8
mm or more.
【Side View】【View from above 】

We are at your service.

We can Plate Powder Plating
Cross-sectional observation of plated Sic powder

SEM photograph

Ni Kα

×6000

Advantages
Reducing metal usage metal by only surface metalizing.
Improvement corrosion resistance by Plating

Materials: Various diameters of particle and kind ofmaterials are available.
Achievement: We have succeeded several types ofplating(Nickel, Copper, etc).
Security Protection: We keep your confidential
matter by non-disclosure agreement(NDA).