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EDITORIAL

iTSSe

TSS

A D V A N C E D M A T E R I A L S & P R O C E S S E S | N O V E M B E R / D E C E M B E R 2 0 1 5

5 0

iTSSe

TSS

8

FEA U E ARTICLE

3. Thermal spray application

Inspection: Wire purity and diameter, current,

voltage, air pressure (<100 psi), DFT, adhesion bond

strength, certified applicator

Intervals between blasting and sealer application is

important

DFT (dry film thickness) of the TSA is achieved with

cross spray application with roughly 75-100

μ

m in

single spray coat

Maintain recommended spray width and gun distance

Bond strength shall average 1800-2000 psi

Sealer coat of Al-silicone application (theoretical

coverage of >38

μ

m)

Visual

General inspection and panel coating procedures are

shown in the images on the previous page. Figure 2 shows

surface profile measurement after blasting according to

ASTM D4417. As per the customer’s specification, the sur-

face profile should be more than 65

μ

m. However, the actu-

al profile was maintained on the higher side (75-90

μ

m) to

obtain better adhesion values. Figure 3 shows preparation

of the test panel (comparator) for adhesion, DFT, finish, and

porosity test (ASTM E2109), which was mandatory for every

applicator for qualification.

Look for Part II of this article in the February 2016 issue

of

iTSSe.

iTSSe

For more information:

Deepashri D. Nage is deputy general

manager, L&T Hydrocarbon Engineering Ltd., R&D Building,

Powai Campus, Gate No. 1, Saki Vihar Road, Powai, Mumbai

- 400 072 (India), +91 22 6705 2780,

deepashri_nage@lntenc. com, www.lntenc.com

.

References

1. P. Ault, TheUse of Coatings for Corrosion Control onOffshore

Oil Structures,

Protect. Coatings Europe,

Vol 11(4), p 42-46, 2006.

2. I. Gedzevicius and A.V. Valiulis, Analysis of Wire Arc Spraying

Process Variables on Coatings Properties, Proceedings of the

12th International Scientific Conference Achievements in Me-

chanical and Materials Engineering, AMME, Gliwice-Zakopane,

Poland, 2003.

3. J. Bland, Corrosion Testing of Flame-Sprayed Coated Steel—A

19-Year Report, Miami, FL: AmericanWelding Society, 1974.

4. R.L. Alumbaugh and A.F. Curry, Protective Coatings for Steel

Pilings: Additional Data on Harbor Exposure of 10-ft Simu-

lated Piling, Report CEL-TR-7115, U.S. Navy Civil Engineering

Laboratory, Port Hueneme, CA, March 1978.

5. AWS C2.23M/C2.23:2003, NACE No. 12, SSPC-CS 23.00,

Specification for the Application of Thermal Spray Coatings

(Metalizing) of Aluminum, Zinc and Their Alloys and Compos-

ites for the Corrosion Protection of Steel.

Automated & Robotic Blasting Systems 800-228-7894 Toll-Free, U.S. & Canada E-mail: ampinfo@guyson.com guyson.com WHERE QUALITY COMES TO THE SURFACE 4 Surface prep for coatings 4 Metallurgical shot peening 4 Nondestructive blast cleaning

Guyson_AMP_halfpg_4c.indd 1

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