Free acidity (FA) determination of free acidity FA pickling tank Jinan Stone aluminum manufacturers, is to verify the effect of the level of rust pickling tank the most direct and effective evaluation methods. Free low acidity, rust poor results. When the free acidity is too high, the work environment mist content is large, is not conducive to labor protection; aluminum surface is easy to produce "excessive corrosion" phenomenon; and residual acid cleaning more difficult Shandong Aluminum Stone price, easily lead to follow-bath contamination. Aluminum advantages: First, welding technology advantages: suitable for industrial production of thin-walled copper and aluminum pipe welding technique, known as a world-class professional manufacturer puzzle Al Stone, is a key technology to connect the air conditioner pipe aluminum and copper. Second, the life of advantages: from the inner wall of tubes, due to moisture-free refrigerant, aluminum connecting pipe wall corrosion will not occur. Third, energy-saving advantage: air conditioner indoor unit and outdoor unit connecting pipe, the lower the energy-transfer efficiency, or that the more power the better the insulation. Fourth, good bending performance, ease of installation, relocation Jinan Al Stone, rolls Aluminum (certified), Al Stone provided by Jinan Heshun Aluminium Limited. Jinan Heshun Aluminum Co. (www.jnhsly.com) Shandong Jinan, aluminum products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Aluminum leadership in cis with the staff warmly welcome all inquiries negotiations to create a better future for aluminum rolls.