6. Anti-chemicals properties
Fig.6 shows an example of anti-chemicals properties of Alstar and 55% Al-Zn. The two products are almost equal in this respect. However in the acid area with a low pH, Alstar is slightly superior.

Fig.-6. Anti-chemicals properties

a) Basic solution :Water solution containing 1g/l of Na2SO4
b) Adjustment of pH solution:
acid side: adjusted with H2SO4
alkaline side: adjusted with NaOH
c) Test method: Test specimen (30 x 60cm) immersed in solution 24 hours and corrosion-attributed weight reduction (g/m2) measured