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40

J

anuary

2011

www.read-tpt.com

T

echnology

U

pdate

Anodising

and coating

AT the 2010 Aluminium Trade Fair in

Essen, Germany, Chemetall showcased

its Gardobond

®

X and Oxsilan

®

AL products

– new chrome-free solutions for the pre-

treatment of aluminium, and the Gardo

®

TP 10748 and Gardo Topseal products

for anodising processes, as well as the

completely borate-free aluminium cleaner

Gardoclean

®

T 5281.

For many years, hexavalent chrome

pre-treatment has been the standard for

aluminium. More recently, chrome-based

pre-treatment processes have come under

pressure for environmental and health and

safety reasons. The first chrome-free pre-

treatment processes started to appear in

the marketplace about 20 years ago.

Today, with almost two decades of

operating experience gained, and hundreds

of users worldwide, the performance of

these programmes is said to be equivalent

to the ‘old’ hexavalent chrome products.

Chemetall’s Gardobond X and OxsilanAL

series chrome-free pre-treatment processes

help producers maximise adhesion and

corrosion protection. Both Gardobond X

4707 and Oxsilan AL 0510 hold Qualicoat

approvals.

Gardo TP 10748, an additive for

alkaline etching, offers improvements

for E-6 etching concerning rinsing and

draining behaviour (ie low viscosity in the

E-6 bath), homogeneity and matt finish

(gloss readings 6-8 achievable, 60° test),

increased productivity (batch optimisation),

and avoidance of surface defects caused by

special alloy composition.

Chemetall’s new Topseal hot-sealing

product series consists of three different

processes adapted to users’ anodising

plants: Topseal Gardo TP 10769 for use in

baths without filtration; TP 10779 for use in

baths with filtration through a filter pump;

and TP 10792/TP 10793 for use in baths

with filtration, optimised to reach longer bath

life circles.

When optimally used, products of the

Topseal Gardo series are claimed to achieve

weight loss values of 10-15mg/dm².

All products can be analysed online or in

Chemetall’s laboratory. Chemetall Topseal

prevents the formation of sealing smut,

gives clean, smut-free surfaces and offers

benefits especially on coloured surfaces.

Chemetall’s Gardoclean T 5281 is a

completely borate-free aluminium cleaner.

The product is liquid and so is easy-to-

use. It provides good cleaning results at

temperatures below 60°C (depending on

condition of parts) and automatic dosage

is possible. Gardoclean T 5281 has been

specifically designed for cleaning aluminium

both in the anodising and pre-treatment

processes.

Chemetall GmbH

– Germany

Fax: +49 69 7165 3428

Website:

www.chemetall.com

Clear Gardobond X 4707 bath