Data Analysis of the Effect of Onion, Glycine and Cassava Additives on the Coating Performance of Zn Electrodeposition on Plain Carbon Steel

Data analysis of the coating performance of Zn electrodeposited plain carbon steel in 0.5 M HCl solution at specific volume addition (5 ml, 10 ml and 15 ml) of onion, glycine and cassava (ON, GY and CS) distillate additives, and at plating time of 15 and 18 mins with respect to 538 h of observation time was performed. Analytical outputs showed ON distillate most effectively improved the Zn electrodeposited by 14% at 10 ml volume and plating time of 15 mins. GY and CS distillate generally improved the Zn electrodeposited at all volumes and plating time with optimal values of 42.7% and 45.7% at 15 ml and plating times of 15 and 18 mins. Generally, coating performance varied significantly with observation time, but marginally with plating time and additive volume. The standard deviation values for onion additive showed significant variation from mean values due to relative thermodynamic instability of it coating performance with respect to observation time. This contrast the output observed for GY and CS additives which signifies thermodynamic equilibrium. The proportion of coating performance data above 10% improvement for the additives are (ON, GY and CS) are 32%, 85% and 78% at margin of error of 11.8%, 9.04% and 10.42%. Analysis of variance showed ON and GY additive volume only, influenced the coating performance output of the additives at 64.56% and 74.67% while CS additive volume and observation time influenced the coating performance output of CS at values of 91.18% and 3.27%.