Product Introduction

Brightener for alkaline zincate type zinc barrel plating
Hyperzinc 310
Nippon Hyomen Kagaku Kabushiki Kaisha R & D center

There are three types of baths for zinc plating: cyanide

Introduction
Surface treatment of iron and steel bolts, nuts, and otherbath, acid bath, and zincate bath. Bolts and nuts used forfastening parts requires various characteristics such as rustautomotive parts come in various sizes and complex shapes,

prevention,andand it is desirable to have a uniform plating film thickness

coefficient of friction. For these requirements, electro-for each individual part. For this reason, zincate baths withgalvanization is a surface treatment method that can be

excellent throwing power are often used. Conventional

mass-produced at low cost with high quality.

brightener for zincate baths has reduced the brightness of theappearance,

dimensional

accuracy,

When bolts and nuts made of high-carbon steel or nickel

plated appearance when baking treatment is performed after

steel are treated with electro-galvanization, hydrogenplating, especially in high current density areas such as bolt

embrittlement becomes a problem. Hydrogen embrittlement

heads, which can cause white discoloration, resulting in a

is a phenomenon in which the metal absorbs hydrogen gas

significant loss of appearance and a decrease in productgenerated during the pretreatment and plating processes,

value.

causing a decrease in the metal of ductility or toughness.
When an embrittled bolt is tightened with a constant load

Product Summary

and time elapses, it may suddenly be fractured, commonly

JASCO Hyperzinc 310 is an alkali zincate-type baking

called delayed fracture. Delayed fracture is difficult tocompatible brightener for barrel baths that does not degrade

prevent by inspection in the case of bolts, etc., because it isplating brightness during the post-plating baking process.

accompanied by little or no deformation in appearance, andTable 1 shows the hyperzinc 310 lineup.

may lead to a major accident. Therefore, it is necessary toFeatures of the Hyperzinc 310

remove the hydrogen absorbed during the plating process.

・No degradation in appearance after baking.

As a method for this, "baking treatment" in which treated・Excellent uniformity of electrodeposition.

products are heated to around 200°C that is a common・Good compatibility with trivalent chromium conversion

degree, and the Japanese Industrial Standards (JIS H 8610)

coatings.

indicates the heating temperature, heating time, and other・Iron plate anodes can be used.

conditions.

・Easy bath management with a wide control range.

Table 1: Lineup of Hyperzinc 310
Product nameUse

Hyperzinc 310AM

Brightener for make-up

Hyperzinc 310A

Brightener for replenishment

Hyperzinc 310B

Brightener for make-up and replenishment

Hyperzinc 310C

Brightener for make-up and replenishment

Hyper soft

Additive for make-up

H-0624

Additive for make-up
JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 1

[Product Introduction] Hyperzinc 310

Pretreatment

Plating

Nitric acidactivation

DryingBakingRustpreventive
coatingDryingFigure 1: General treatment process for baked galvanized products

Treatment processof components after prolonged heating, resulting in

The general treatment process for baked galvanized

brightness degradation in the Hull cell pattern, Hyperzinc

products is a series of processes from pretreatment such as

310 shows no brightness degradation, confirming that it is adegreasing and pickling to plating, nitric acid activation, andbrightener that does not deteriorate easily.

drying. Then, after baking and cooling, rust-preventive
coatings such as trivalent chromium conversion coat

Hull cell plating test condition: 2A, 10 minutes

products. (Figure 1)
Hull cell
test 1

Mechanisms
In zincate-type alkaline zinc plating baths withoutbrighteners, the electrodeposited film is spongy or dendritic(dendrite structure) and no dense film is deposited. To obtain

technology of the existing Hyperzinc series brightening

Hull cell
test 2

agents, and by introducing a newly developed brightening

Hull cellcomponent, it is now possible to obtain a uniform and brightpattern

plating appearance without deterioration of appearance evenat baking temperatures around 200°C. (Figure 2)Hyperzinc 310

Conventional bath

Maintain brightness

Decrease brightness

1

Keep at50°C for96 ha bright and uniform appearance depends almost entirely on
the ability of the brightener. Hyperzinc 310 inherits theHyperzinc 310

2

Figure 3: Comparison of degradation of brightener due toplating solution allowed to stand at 50°C for 96 hours

Conventional bath
Since it is a brightener that does not deteriorate easily, it does
not easily upset the balance of its components even afterBolt

long-term operation. This improves chemical management,heads

as there are few cases where separate additives are required,and management can be done only by automatic replenishers.

Figure 2: Appearance after baking of Hyperzinc 310 andIn closing

conventioal bath (Plating thickness: 15 μm)

The JASCO Hyperzinc series have been sold for more

Baking condition: 200°C, 4 hours

than 20 years in Japan and overseas as a pioneer of uniform

Hyperzinc 310 is also resistant to degradation in theelectrodeposition type brightener for zincate baths, and haveplating solution. In conventional mass production plating

been well received by many customers. Hyperzinc 310 is alines, there are cases where brightener is added tobrightener that overcomes the challenges of baking

compensate for the decrease in brightness that occurs whenprocesses by combining the technical know-how developed

work resumes after holidays, which is one of the reasons foraccumulated to date.

the decrease in workability. Figure 3 shows the results of acomparison test of brightener degradation. Hyperzinc 310
brightener and conventional brightener were added to azincate zinc plating bath and allowed to stand at 50°C for 96
hours, and a Hull cell plating test was conducted before andafter heating the plating solution to compare the Hull cellpatterns. While conventional brightener shows degradation
JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 2