钢筋在硫酸盐模拟溶液中的腐蚀行为研究

Corrosion behavior of reinforced bar in sulphate solution

盐湖及盐渍土地区广泛存在的硫酸根离子除对混凝土本体造成破坏外,也可通过渗透达到混凝土中钢筋表面,从而影响钢筋的腐蚀行为。利用不同浓度的单一硫酸钠、硫酸钠与水泥粉末复合溶液,以及硫酸钠与饱和石灰溶液复合模拟溶液作为腐蚀介质,研究钢筋在上述模拟溶液中的腐蚀行为。研究结果表明：纯Na2SO4与加入饱和Ca（OH）2溶液后对钢筋的锈蚀影响不同,在1～2 h内就产生明显的锈蚀现象;SO2-4对钢筋的腐蚀不同于Cl-,模拟硫酸盐溶液对钢筋起到一定缓蚀的作用,腐蚀电流密度是先减小后增大的趋势;硫酸钠与饱和石灰溶液反应生成石膏会覆盖钢筋表面,延缓钢筋锈蚀速率。

Salt Lake and Saline Soil Area widespread sulfate ions in addition to the concrete body damage, but can also be reached by penetration of reinforced concrete surface, thus affecting the corrosion behavior of steel. A single different concentrations of sodium sul- fate, sodium sulfate and cement powder composite solutions, as well as sodium and saturated lime solution composite analog solution as corrosive media, study the corrosion behavior of steel in the above simulation solution.The results show that pure Na2 SO4 and added sat- urated Ca（OH） 2. After the impact of corrosion of reinforcement are also different in the 1-2 h to produce significant corrosion phenom- ena. SO4^2- corrosion of steel differs from Cl -, simulation sulfate solution reinforced play a role in the inhibition of the corrosion current density decreases and then increases after the first. Sodium reacts with saturated lime plaster solution will cover the steel surface,dela- ying steel corrosion rate.