How to check whether
hardware spring meets the requirements?
Spring factory here share some detection methods.
Black hardware spring after checking methods
shape detection: containing silicon alloy steel as the red brown, of other alloy steel as dark gray, diazotization reaction film should fit in the high density, does not need to be black, surface hair flower, there will be a bright red and dark brown on adhesion.
Corrosion resistance of inspection: will play yellow clear the surface with alcohol or gasoline drying, covered in 2% of the copper sulfate solution 45 s, after take off into the water after removal, surface don't need a bright red spots appear.
Phosphating film shape should be symmetrical, not hair flower, the surface of the deep grey or dark red, corrosion resistance of inspection
there are two ways.
1 application in the test solution, copper sulfate solution composition calculated: 0.
June 30 ml0 ncuso4 solution 50 ml12 % NaCl solution.
5 0 HCL solution.
After 7 ml3 solution blending, drop on the surface of the spring that alcohol clearance, recording time appear bright red spots, all the normal phosphating film * less can keep 1 MLN.
2, salt water intrusion brewing methods: will the spring after phosphating, covered in 3% salt solution 18 MLN, remove the clear water after cleaning, 45 MLN placed in dry gas, don't appear yellow rust, is to pass the exam
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