Corrosion inhibition of alpha brass by 1-phenyl-3-methyl-pyrazol-5-one in acidic media at different temperatures

Abstract

Corrosion inhibition of alpha – brass (70% Cu/30% Zn) by 1 – phenyl –3 – methyl – pyrazol –5- one (HPMP) in different acidic media using the weight loss method at room temperature, 40oC, 50oC and 60oC has been investigated. At room temperature, maximum weight losses of about 0.1454g, 2.7396g and 0.0517g in HCl, HNO3 and HClO4 respectively were recorded without the inhibitor. However, weight losses of 0.0265g, 0.0212g and 0.0089g in HCl, HNO3 and HClO4 respectively were recorded when the inhibitor was used at room temperature. At higher temperatures higher weight losses were recorded even when higher concentrations of the inhibitor were used. The results obtained showed that HPMP is an effective inhibitor of alpha brass in these media. The corrosion inhibition efficiency (C.I.E.) of the alpha brass was 99.83%, using the condition of 3.0M HNO3 for the uninhibited experiment and 0.03M HPMP for the inhibited experiment at 29°C after the 7th day, and the rate constant (K) was 4.03 x 10-6(s--1).



Keywords: Corrosion inhibition, Acidic Media, Alpha Brass, inhibition efficiency, Rate constants.


[Global Jnl Engineering Res. Vol.2(1&2) 2003: 77-84]