Tue, 07 Sep 2010 18:30:46 -0700 http://www.materialsforum.com/ Lussumo Vanilla 1.0.3 http://www.materialsforum.com/discussion/16/?Focus=19#Comment_19 http://www.materialsforum.com/discussion/16/?Focus=19#Comment_19 Sat, 20 Jan 2007 18:36:54 -0800 matco
Zinc corrosion products are typically white, but under certain conditions may also take the form of a grey or black deposit on the metal surface. Accelerated corrosion of galvanized steel pole, white rust and storage stain (tiger striping) can occur when galvanized surfaces are held for extended periods in wet conditions immediately after the hot dip process. The surfaces may become wet either by rain fall or by condensation. The corrosion products form after zinc reacts with moisture. Corrosive compounds such as chlorides from marine and sulfur containing atmospheres accelerate the formation of white rust.

Utility poles can be divided into three portions as far as corrosion is concerned:
1. Above ground atmospheric exposure.
2. Ground level exposure.
3. Underground soil /ground water exposure.

The extent of the corrosion in storage and transportation is primarily dependent on:
a) The duration of the exposure to moisture.
b) The temperature that is experienced during storage or transportation.
c) The presence of accelerating corrosive agents, such as chloride-containing salts.
d) Position of galvanized component (vertical or horizontal).
e) Metallurgical structure of galvanized layer and surface composition.]]> http://www.materialsforum.com/discussion/16/?Focus=20#Comment_20 http://www.materialsforum.com/discussion/16/?Focus=20#Comment_20 Sat, 20 Jan 2007 18:38:37 -0800 matco http://www.materialsforum.com/discussion/16/?Focus=21#Comment_21 http://www.materialsforum.com/discussion/16/?Focus=21#Comment_21 Sat, 20 Jan 2007 18:40:49 -0800 matco