1. Nitric acid point test:
Ib qho tseem ceeb ntawm cov yeeb nkab square yog nws qhov kev tiv thaiv corrosion rau dilute thiab concentrated nitric acid.
2. Magnetic test:
Lub raj square magnetic test yog txoj kev yooj yim tshaj plaws kom paub qhov txawv ntawm daim ntawv annealing. Nws ua me ntsis sib nqus tom qab txias ua haujlwm nyob rau hauv siab; Thaum cov hlau tsis tshua muaj hlau thiab chromium hlau yog ob qho tib si sib nqus hlau.
3. Sulfuric acid xeem:
Lub ntim concentration ntawm sulfuric acid test tov yog 10% thiab nws yog rhuab mus rau 71 degree. Thaum lub raj square yog immersed nyob rau hauv cov tshuaj kub no, nws yog corroded sai heev thiab ib tug loj tus naj npawb ntawm npuas yog generated, thiab cov qauv sai sai tig dub nyob rau hauv ob peb feeb.
4. Copper sulfate point test:
Qhov ntsuas tooj liab sulfate point yog qhov yooj yim tshaj plaws thiab ceev tshaj plaws kom paub qhov txawv ntawm cov pa roj carbon zoo tib yam los ntawm txhua hom.
