DOX-Steel®Corrosion Proof Technology

LABORATORY IMMERSION CORROSION TEST

MASS LOSS TEST UNDER

MECHANICAL STRESS

TEST CONDITIONS

Test specimens

½ x 3 ½ ASTM A193 B7 all thread stud w/2 each ASTM A194 grade 2H heavy hex nuts

CoatingsZincZinc-NickelDOX

Immersion conditions

• Tank volume: 8 L (2.1 gallons)

• Substitute Ocean Water according to ASTM D1141 -

98(2013)

• Temperature: 25 °C (77 °C)

• pH= 8.2

• Mechanical agitation

• Immersion time: 408 h

Device configuration and torque

DOX-SteelTorque: 72 Lb ft

Zinc Zinc-Nickel

t= 0 h

t= 240 h

ZincZinc-Nickel

DOX

End of immersion

Zinc Zinc-Nickel

DOX-Steel

RESULTS

Zn plating Zn-Ni DOX-Steel0

100

200

300

400

500

600

700

539573

0.1000

452412

0.0823

Corrosion Rate in sea water

Fastener tension Fastener no tension

Corr

osio

n ra

te µ

m/y

ear

What is next?

• Electrochemical testing of fasteners under mechanical stress

• Electrochemical testing of fasteners under mechanical stress and cathodic protection