Product Introduction

Water soluble rust inhibitor
5K188
Nippon Hyomen Kagaku Kabushiki Kaisha R & D center

Introduction

Product Summary

When transporting or storing steel and other metal

5K188 is a low-foaming, water-soluble rust inhibitor thatmaterials and metal products, it is necessary to prevent theprovides excellent rust inhibiting performance on steel. Itformation of rust. The method is specified in the JIS Z

can be used not only for temporary corrosion prevention

0303 General rule for rust preventive packaging method.

of steel, but also for corrosion prevention of non-platingThe rust inhibitor to be used should be applied considering

areas such as pipe inner surfaces. In addition to 5K188, wethe period of transportation and storage, and thealso offer a lineup of other products according to theenvironmental conditions during that period. Various

application and purpose. (Table 1)

types of rust inhibitors have been proposed, including rust

Featuresinhibiting oils, rust inhibitors, rust inhibiting papers and・ A low-foaming, water-soluble rust inhibitor thatfilms, inhibitors, chelating agents, and adsorbents. We willdries quickly and produces a uniform appearance.

introduce our temporary rust inhibitors with a focus on our・ Rust prevention for non-plating areas such as pipe

newly developed water-soluble rust inhibitor for steel,
5K188.

inner surfaces
・ Almost no effect on appearance and corrosion
resistance of trivalent chromium conversion
coatings

Table 1: Product Lineup of Major Water-Soluble Corrosion Inhibitors
Product nameUse

5K188

Rust prevention for pipe inner surface, temporary rust prevention for steel
Rust prevention for pipe inner surface, temporary rust inhibitor for steel

5A001

and various plating coatings

5G175
GX-236

Rust prevention for pipe inner surface, temporary rust prevention for steel
Temporary rust inhibitors

Low-foaming, cleaning and rust inhibitor for steel
Temporary rust inhibitor for steel, rust inhibitor additive for water soluble

GX-237

cutting fluid
Cleaning and rust inhibitor for iron, zinc alloys, aluminum alloys, and1B011
M-194 improved

Purposecopper alloys
Neutralizing rust inhibitor

Neutralizing rust prevention after pickling

20221102 JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 1

［Product Introduction］Water soluble rust inhibitor 5K188

Treatment process

Table 2: Treatment Conditions of 5K188

5K188 is used by adding 0.5 to 2 % to water. No special

Concentration

20 mL/L (5 to 20 mL/L)

equipment is required, and the same processes andTemperature

Room temperature (15 to 40 °C)

facilities can be used as in the past. (Figure 1, Table 2)Treatment time

30 sec (10 to 60 sec)

Rinsing
Pretreatment

→

5K188

→

Rinsing
Pretreatment→

DryingRinsing
Zinc plating→

Rinsing
Post-treatment

→

5K188

→

DryingFigure 1: Example of Treatment Process

Mechanisms

In closingMany metals, including iron, corrode under the action of

5K188 is a low-foaming, water-soluble rust inhibitor thatwater and oxygen. There are various theories on theprovides excellent rust inhibiting performance on steel. It

corrosion prevention mechanism of water-soluble rustis used not only as a rust inhibitor for steel, but also as ainhibitors, but they are divided into oxide film type andtemporary rust inhibitor for non-plating areas such as pipe

adsorption type (Figure 2), which protect base metals frominner surfaces. In addition to 5K188, we also develop andcorrosive environments by forming an oxide film orprovide various other types of products according to theadsorbing on the metal surface. 1, 2 (Figure 3)

application and operating environment.
References
1: Masayoshi Kato et al.,Base metal

Base metal

Kinzokuhyoumenkougyouzensyo (13), 48-64 (1973)
2: Nobuyoshi Hara, Fundamentals of Corrosion ofAdsorption type

Oxide film typeMetals, J. Vac. Soc. Jpn. Vol.44, No.10, 2001

Figure 2: Type of Water-soluble Rust Inhibitors
O2

O2
H 2O

H 2OOH-Fe2+Fe(OH) 2

Protect base metals fromcorrosive environments
Temporary rust inhibitors

Fe2e-

Base matel(iron)

Base matel(iron)Without rust prevention treatment

With rust prevention treatment

Figure 3: Rust Formation Mechanism and Effect of Watersoluble Rust Inhibitor
20221102 JASCO Nippon Hyomen Kagaku Kabushiki Kaisha 2