Abstract
A series of tetra-alkoxysilanes and dimethyldialkoxysilanes (silicate esters) was prepared by reacting SiCl4 and (CH3 )2 SiCl2 respectively with corresponding alcohols. The performance of these silicate esters as temporary protectives for mild steel surfaces has been studied by assessing the time to appearance of the first rust spot on the specimen surface, electro chemical potential changes, and the percentage protection given by these esters to steel plates under different conditions using natural sea water containing 1%Na2 SO4 with various additives including thiourea and nicotinic acid. The corrosion resistance imparted by dimethyldialkoxysilanes is greater than that imparted by tetra-alkoxysilanes. However, for both series of silicate esters, those which have high molecular weight and branching in the alkyl fraction confer better corrosion resistance than those with low branching and a linear structure. Similar measurements were made for steel coated with silicone fluid and liquid paraffin and for uncoated steel for the purpose of comparison.
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