My aim is to find a suitable experimental Design method for determining the corrosion rate on galvanised steel on four different environmental factors. My influencing factors are Temperature (40°C,50°C & 70°C), pH(1,3,5,7), Electrolyte concentration (2.5 wt%, 15wt% and 30wt%) and Fumigation (Nitrogen,Oxygen). I would like to know which experimental design of experiment method is to be used in this problem?
Niksy Maria Prince Niksy, Because what we learn from the initial experiment(s) often leads to redefining what’s a suitable method it makes the question more complex than expected. I’m sorry if that’s vague. But a good experiment helps to us understand what we’re looking at as well as asking. In my opinion it doesn’t matter how perfect of great the method is as much as what we do next....with the results. In my experience the hardest part of experiments is they raise more questions. And the hard part; figureing out what the "real" question is.
The link below will give you an intro to the way to look at creating experiments. Even as an intro it can be overwhelming…My advice talk to colleagues in your field about the design and question everything.
Link is, “Guide to Experimental Design”. The basic steps are:
1. Consider your variables and how they are related
2. Write a specific, testable hypothesis
3. Design experimental ways to manipulate independent variables
4. Assign subjects to groups, either between or within subjects (???)
5. Plan how you will measure your dependent variable
After the intro is a table of contents. That’s a good place to start
https://www.scribbr.com/methodology/experimental-design/
Niksy Maria. -- I’m sending these for help study the corrosion of steel. Though I don’t know if either is suitable for your work, each seems to offer ideas for what’s useful to include. I have worked with ASTM and found their recommended conce established & and widely familiar. But on the latest tools and techniques. The last links address Galvanizaton
1)__ ASTM (this is a well establish US group who sets standards for measurement and analysis and evaluation.
“Environmental Factors Affecting the Corrosion of Galvanized Steel”
Galvanized steel samples are exposed for periods of up to 30 months at nine air monitoring sites in the St. Louis, MO area. Climatic and air quality data are recorded during the exposure periods and subjected to a rigorous evaluation to eliminate recording errors and to estimate missing values. Weight loss is used as the measure of zinc corrosion on the galvanized steel. The corrosion rate is evaluated with respect to fluxes of pollutants (sulfur oxides, nitrogen oxides, oxidants, and particles) to the galvanized steel during both wet and dry periods, (2) temperature, and (3) amount of rainfall at Lambert Field (airport). Different definitions of when the galvanized steel was wet are evaluated to determine the most likely “critical relative humidity.” A theoretical model of film buildup and dissolution is developed to explain how factors affect corrosion rates. Nonlinear and linear multiple regression techniques are used to determine the statistical significance of each factor.
https://www.astm.org/stp25855s.html
2)__ Science Direct
Evolution of corrosion degradation in galvanised steel bolts exposed to a tropical marine environment. — The time-dependent degradation of galvanised steel bolts subjected to marine atmospheric exposure for a maximum period of 2 years in the Wenchang marine environment of Hainan province, South China, was investigated.
https://www.sciencedirect.com/science/article/pii/S2238785423027448
3)__ Estimating Galvanized Steels Service Life in Soil. — Due to varying physical and chemical characteristic of soil, it is difficult to predict underground corrosion rates. Even in very close proximity, soil content conditions can have significant variations. In order to predict the performance of hot-dip galvanized steel in the soil, you must first try and classify the soil to which the galvanized steel will be exposed. The properties of soil that have the most effect on the corrosion rate are aeration, moisture content (or time of wetness), pH, temperature, and resistivity.
https://galvanizeit.org/knowledgebase/article/estimating-galvanized-steel-s-service-life-in-soil
4)__ Performance of Galvanized Steel in Different Environments. — Does hot-dip galvanized steel perform the same in any type of environment?
Hot-dip galvanized steel is specified in many different applications and environments. Exposure conditions include atmospheric, submerged applications, chemical environments, and soil. Although the galvanized coating provides a barrier and cathodic protection in each of these environments, the mechanism of corrosion protection can be different. Lets explore how the hot-dip galvanized coating protects the underlying steel in different environments.
https://galvanizeit.org/knowledgebase/article/performance-of-galvanized-steel-in-different-environments
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