Better alloy coating processing factory in Wuxi - Wuxi Xing Bao Chemical Coating Plant

Nickel-phosphorus alloy coating corrosion resistance corrosion performance, due to the amorphous nickel phosphorus alloys are homogeneous single-phase system, grain boundaries, dislocations and other structural defects and chemical component segregation it does not exist, it will not produce intergranular corrosion and stress corrosion, pitting corrosion resistance is far better than crystalline alloys. Thus, hydrogen chloride gas at room temperature calculus, high temperature neutral and non-oxidizing inorganic and organic gaseous hydrogen chloride boiling temperature, boiling compounds, hydrofluoric acid concentrated hot caustic soda, hypochlorite and acetic acid, lactic acid and other media have very excellent corrosion resistance, corrosion resistance in some medium superior to Hastelloy B, Monel alloy no less, than the commonly used nickel and austenitic stainless steel. A salt spray test, test condition test solution: 5% NaCl temperature: 35 ± 2 ℃ continuous spray 8 hours, 16 hours to stop spraying test panels 4.5 × 7.0cm steel plate, the surface plated nickel-phosphorus alloy coatings with different thickness II. Test Results Sample No. Coating Thickness (um) a first time point occurs rust (hours) I-1 12> 1200 I-2 20 I-3 25 I-4 40 Ⅱ-1 18 Ⅱ-2 24 Ⅱ-3 33 Typical applications for domestic and bending and thermal shock two methods of chemical plating nickel-phosphorus alloy coating adhesion with copper and carbon steels were tested. Test sample size of 45 × 70 × 1mm surface deposits 50 ~ 100um nickel-phosphorus alloy coating. The sample bending method is repeated 180 degree bend, until no sample inspection at the break in the coating has peeled off from the base surface. Thermal shock method is heating the sample to 200 ℃, and the sample was immersed in water at room temperature after quenching, check whether the blistering coating. The results after either copper or carbon steel substrate samples were 180 degree bend without peeling off the coating, plating thermal shock tests have found no blistering. With a hammer, not peeling. The corrosion rate of amorphous Ni 10 ~ 11% P alloys in the following media in medium temperature ℃ corrosion rate (mm / year) Ni-P alloy stainless steel 3% sodium chloride Cr18Ni19 boiling 0.00286 0.05-0.5∞ * 20% ammonium chloride Boiling 0.0874 0.5-1.5∞ * 10% zinc chloride boiling 0.0027 0.5-1.5∞ * 20% aluminum chloride 60 0.076> 1.5 20% aluminum chloride boiling 4.241> 1.5 10% ferric chloride 30 1.765> 1.5∞∮ 10% copper chloride 30 2.067> 1.5∞∮ 10% copper sulfate 60 0.301 0.05-0.5∮ 7% sodium boiling <0.001> 1.5∞∮ 20% ammonium hydrogen fluoride 60 0.0415 -∞ 35% oxalic acid boiling 0.0363> 1.5∮ 20% tartaric acid 60 0.0228 <0.05 20% 50% tartaric acid boiling 0.05-0.5 0.474 60 0.035 0.05-0.5∮ 50% citric acid, citric acid, boiling 1.003> 1.5∮ 20% Sulfosalicyl 60 0.0624 45% lactic acid boiling 0.05-0.5 0.237> 1.5 ∞∮ 99% acetic acid boiling 0.0779> 1.5 36% acetic acid boiling <0.0805> 0.5-1.5 88% formic acid boiling 0.0102> 1.5 2N hydrochloric acid 30 0.0385> 1.5 37% hydrochloric acid 30 0.0407> 1.5 2N hydrochloric acid 50 0.253> 1.5 50 1.001 37% hydrochloric acid > 1.5 10% sulfuric acid 60 0.0424> 1.5∮ 30% sulfuric acid 60 0.185> 1.5∮ 20% hydrofluoric acid 60 0.0576> 1.5 * ∮ 40% hydrofluoric acid 30 0.0141> 1.5 * ∮ 40% hydrofluoric acid 60 0.266> 1.5 * ∮ 53% phosphoric acid 60 0.0632> 1.5 60 0.136 85% phosphoric acid> 1.5 Note: The table indicates a potentially pitting ∞; ∮ indicates a potential for intergranular corrosion; * indicates a potential for stress corrosion cracking.