All parts of high-speed guardrail panels generally adopt hot-dip galvanizing for metal surface treatment. In order to ensure its anti-corrosion performance, it is necessary to test from three aspects: the adhesion of the galvanized layer, the uniformity of the galvanized layer and the adhesion of the galvanized layer.

 

(1) Adhesion of zinc coating

 

The adhesion test of the galvanized layer adopts the hammering method. The test piece is placed horizontally, the hammer head faces the center of the platform, the hammer handle is perpendicular to the base plane, and then falls freely, hits five points in parallel at 4mm intervals, and judges its adhesion by checking the surface state of the zinc layer and whether there is peeling and bumping of the zinc layer. Sex. The striking point should be 10mm away from the end of the specimen, and the same point should not be hit twice.

 

(2) Material performance test

 

The properties of steel mainly refer to mechanical properties, which can be divided into strength properties, plasticity and impact toughness. Strength performance refers to the resistance of steel to plastic deformation and damage, including elastic limit, yield limit, strength limit, fatigue limit and hardness. Plasticity represents the plastic deformation capacity of steel, including elongation. Area reduction rate and cold bendability. Impact toughness indicates the resistance of steel to impact loads. Since the content of various components in the material affects the mechanical properties of the steel, the performance test of the raw material of the steel plate includes chemical analysis, tensile test and bending test.