[12th grade: research] What statistical analysis to use?

Good day! As the title says, can you suggest a statistical test for comparing this:

• We have 1 independent variable (a plant extract) but it has 4 levels of concentration
• Each level will have 3 replicates to be tested once after 14 days
• The dependent variable is corrosion inhibition and we will test it using more than 1 parameter: corrosion rate and inhibition efficiency using two tests

We initially decided to use one-way ANOVA for each test and we will just compare it with each other. However, upon discussing with our teacher, he suggested to use two-way ANOVA, but I don't think it fits the study since we only have 1 independent variable. So now, we are looking for other statistical analysis to use.

Any suggestion or comment is very much appreciated. Thank you!