Waveform guardrail all parts of general use hot dip galvanized metal surface treatment

Waveform guardrail all parts of general use hot dip galvanized metal surface treatment, in order to guarantee its anticorrosive performance, from galvanized layer adhesion amount, galvanized zinc coating adhesion and uniformity performance testing from three aspects. So what is the testing standards for them, now I come to you to explain. (1) the galvanized layer adhesion of galvanized layer adhesion test by hammering method. Specimen in horizontal, hammer head center for test bench, the hammer handle and the base free fall after the perpendicular to the plane, parallel to the strike at 4 mm intervals at five o 'clock, by examining the zinc layer surface state, whether the zinc layer stripping bulge phenomenon, and pvc fence www.jtwiremesh.com. Hit points should be from the sample end 10 mm, the same point may not strike twice. (2) the material performance test the performance of the steel is mainly refers to the mechanical performance, can be divided into strength, plasticity and impact toughness. Strength steel resistance of plastic deformation and destruction, including elastic limit, yield limit and ultimate strength, fatigue limit and hardness. Plastic steel plastic deformation ability, including elongation. Area reduction ratio and the cold bending property. Impact toughness of said steel's resistance to impact load. Because of the influence of material components content in high and low steel mechanical properties, so the performance testing for steel raw materials including chemical analysis, tensile test and bending test. (3) zinc coating adhesion test used in the galvanizing zinc zinc should be specified in the GB470 0 or 1, zinc, zinc attached quantity and quantity of galvanized zinc layer thickness should comply with the attached test can adopt antimony trichloride or coating thickness gauge test. Antimony trichloride method basic principle: because the zinc can be completely dissolved in concentrated hydrochloric acid in the solution of antimony trichloride, dissolve twice before and after weighing, calculate the zinc adhesion amount per unit area. Galvanized component attached to measure average zinc adhesion component name (g/m2), minimum amount zinc attachment (g/m2) average zinc layer thickness (mm) minimum zinc layer thickness (mm)Guardrail plate600425 & ge, end, pvc fence www.jtwiremesh.com; 85 & ge; Fasteners, block, towing bracket 350275 & 61 ge; 50 & ge; 39 4. Galvanized layer uniformity test of galvanized layer uniformity test using copper sulfate method in general. Principle: etching samples by using copper sulfate solution, and degree of substitution of zinc metal time, judge the uniformity of the coating. Sample preparation: 36 g chemical pure copper sulfate dissolved in 100 ml of distilled water, heat to dissolve after cooling to room temperature, adding copper hydroxide or copper carbonate (21 l with 1 g) copper sulfate solution, stirring evenly mixed, and still more than 24 h, the filtered solution is needed for the sample. Erosion test method: take three pieces of sample for test, each time still for 1 min, not stirring and mobile samples, sample done after rinse out with clean dry erosion next time. If zinc layer, by copper sulfate erosion after five times the same red sample without plating on copper). Erosion test solution can only be 15 times. If the guardrail manufacturer to provide raw materials factory to issue certificate of quality, only do the tensile test. If have doubt on steel, the three test must be performed.

The product with cold bending forming corrugated plate or Q235 carbon steel pipe for the base material

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