Corrosion protection of brasses and zinc in simulated urban rain. Part II. The combination of inhibitors benzotriazole and 2‐mercaptobenzimidazole with stearic acid

Combinations of stearic acid (SA) and organic inhibitor benzotriazole (BTAH) or 2‐mercaptobenzimidazole (2‐MBI) were studied as corrosion inhibitors of brasses Cu10Zn and Cu40Zn and of Zn in simulated urban rain. In Part I, where self‐assembled layers of individual inhibitors (BTAH, 2‐MBI and SA) were studied, the SA layer performed best. Here the properties of layers were also tested with weight loss immersion tests, polarization measurements and electrochemical impedance spectroscopy measurements. Results of the weight loss immersion test, polarization measurements and electrochemical impedance spectroscopy measurement showed that combining organic inhibitor and stearic acid improves the corrosion protection properties of the self‐assembled layers. The contact angles of layers made with combinations of organic inhibitor and SA were higher than for individual SA layers.