#1 Car Club In Kitchener - Waterloo - Cambridge - Guelph - View Single Post - two things... ALS body guys, and website for front bumpers

**vwguy** · 08-14-2004, 02:23 AM

Even tough they weld new steel there is still old steel at some point more prone to rust. Also where the welds will be done there will be pores left that will allow moisture and rust ill make its way back, mostly from the old part of the panel. We learned about this corrosion stuff in school
You have to realize that the weld material and the existing panel are differnt types of metal and one can act as a catode while the other as an anode and the moisture can be the liquid required (electrolysis (sp.)) to form a mini battery that will cary metal from one panel and deposit it to the weld seam. Anyways that is a short explanation of what could happen and why rust will come back.

08-14-2004, 02:23 AM	#10 (permalink)
vwguy VM Founder & Moderator Posts: 15,577 Location: Waterloo, Ontario Join Date: Nov 2003 Ride: 2001 VW Golf 1.8T Fav Mod: CF Hatch Class: All Out	Even tough they weld new steel there is still old steel at some point more prone to rust. Also where the welds will be done there will be pores left that will allow moisture and rust ill make its way back, mostly from the old part of the panel. We learned about this corrosion stuff in school You have to realize that the weld material and the existing panel are differnt types of metal and one can act as a catode while the other as an anode and the moisture can be the liquid required (electrolysis (sp.)) to form a mini battery that will cary metal from one panel and deposit it to the weld seam. Anyways that is a short explanation of what could happen and why rust will come back. ------------------ Nick \| 2001 Golf 1.8T \| www.mygolfiv.com \| www.hpaddicts.com \| Need Cheap Hosting ?? www.WEJhosting.com $50/Year